Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2150 insertions, 0 deletions

diff --git a/nsprpub/pr/src/misc/prtime.c b/nsprpub/pr/src/misc/prtime.c
new file mode 100644
index 0000000000..6d711a6b8d
--- /dev/null
+++ b/nsprpub/pr/src/misc/prtime.c
@@ -0,0 +1,2150 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * prtime.c --
+ *
+ *     NSPR date and time functions
+ *
+ */
+
+#include "prinit.h"
+#include "prtime.h"
+#include "prlock.h"
+#include "prprf.h"
+#include "prlog.h"
+
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>  /* for EINVAL */
+#include <time.h>
+
+/*
+ * The COUNT_LEAPS macro counts the number of leap years passed by
+ * till the start of the given year Y.  At the start of the year 4
+ * A.D. the number of leap years passed by is 0, while at the start of
+ * the year 5 A.D. this count is 1. The number of years divisible by
+ * 100 but not divisible by 400 (the non-leap years) is deducted from
+ * the count to get the correct number of leap years.
+ *
+ * The COUNT_DAYS macro counts the number of days since 01/01/01 till the
+ * start of the given year Y. The number of days at the start of the year
+ * 1 is 0 while the number of days at the start of the year 2 is 365
+ * (which is ((2)-1) * 365) and so on. The reference point is 01/01/01
+ * midnight 00:00:00.
+ */
+
+#define COUNT_LEAPS(Y)   ( ((Y)-1)/4 - ((Y)-1)/100 + ((Y)-1)/400 )
+#define COUNT_DAYS(Y)  ( ((Y)-1)*365 + COUNT_LEAPS(Y) )
+#define DAYS_BETWEEN_YEARS(A, B)  (COUNT_DAYS(B) - COUNT_DAYS(A))
+
+/*
+ * Static variables used by functions in this file
+ */
+
+/*
+ * The following array contains the day of year for the last day of
+ * each month, where index 1 is January, and day 0 is January 1.
+ */
+
+static const int lastDayOfMonth[2][13] = {
+    {-1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364},
+    {-1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}
+};
+
+/*
+ * The number of days in a month
+ */
+
+static const PRInt8 nDays[2][12] = {
+    {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+    {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
+};
+
+/*
+ * Declarations for internal functions defined later in this file.
+ */
+
+static void        ComputeGMT(PRTime time, PRExplodedTime *gmt);
+static int         IsLeapYear(PRInt16 year);
+static void        ApplySecOffset(PRExplodedTime *time, PRInt32 secOffset);
+
+/*
+ *------------------------------------------------------------------------
+ *
+ * ComputeGMT --
+ *
+ *     Caveats:
+ *     - we ignore leap seconds
+ *
+ *------------------------------------------------------------------------
+ */
+
+static void
+ComputeGMT(PRTime time, PRExplodedTime *gmt)
+{
+    PRInt32 tmp, rem;
+    PRInt32 numDays;
+    PRInt64 numDays64, rem64;
+    int isLeap;
+    PRInt64 sec;
+    PRInt64 usec;
+    PRInt64 usecPerSec;
+    PRInt64 secPerDay;
+
+    /*
+     * We first do the usec, sec, min, hour thing so that we do not
+     * have to do LL arithmetic.
+     */
+
+    LL_I2L(usecPerSec, 1000000L);
+    LL_DIV(sec, time, usecPerSec);
+    LL_MOD(usec, time, usecPerSec);
+    LL_L2I(gmt->tm_usec, usec);
+    /* Correct for weird mod semantics so the remainder is always positive */
+    if (gmt->tm_usec < 0) {
+        PRInt64 one;
+
+        LL_I2L(one, 1L);
+        LL_SUB(sec, sec, one);
+        gmt->tm_usec += 1000000L;
+    }
+
+    LL_I2L(secPerDay, 86400L);
+    LL_DIV(numDays64, sec, secPerDay);
+    LL_MOD(rem64, sec, secPerDay);
+    /* We are sure both of these numbers can fit into PRInt32 */
+    LL_L2I(numDays, numDays64);
+    LL_L2I(rem, rem64);
+    if (rem < 0) {
+        numDays--;
+        rem += 86400L;
+    }
+
+    /* Compute day of week.  Epoch started on a Thursday. */
+
+    gmt->tm_wday = (numDays + 4) % 7;
+    if (gmt->tm_wday < 0) {
+        gmt->tm_wday += 7;
+    }
+
+    /* Compute the time of day. */
+
+    gmt->tm_hour = rem / 3600;
+    rem %= 3600;
+    gmt->tm_min = rem / 60;
+    gmt->tm_sec = rem % 60;
+
+    /*
+     * Compute the year by finding the 400 year period, then working
+     * down from there.
+     *
+     * Since numDays is originally the number of days since January 1, 1970,
+     * we must change it to be the number of days from January 1, 0001.
+     */
+
+    numDays += 719162;       /* 719162 = days from year 1 up to 1970 */
+    tmp = numDays / 146097;  /* 146097 = days in 400 years */
+    rem = numDays % 146097;
+    gmt->tm_year = tmp * 400 + 1;
+
+    /* Compute the 100 year period. */
+
+    tmp = rem / 36524;    /* 36524 = days in 100 years */
+    rem %= 36524;
+    if (tmp == 4) {       /* the 400th year is a leap year */
+        tmp = 3;
+        rem = 36524;
+    }
+    gmt->tm_year += tmp * 100;
+
+    /* Compute the 4 year period. */
+
+    tmp = rem / 1461;     /* 1461 = days in 4 years */
+    rem %= 1461;
+    gmt->tm_year += tmp * 4;
+
+    /* Compute which year in the 4. */
+
+    tmp = rem / 365;
+    rem %= 365;
+    if (tmp == 4) {       /* the 4th year is a leap year */
+        tmp = 3;
+        rem = 365;
+    }
+
+    gmt->tm_year += tmp;
+    gmt->tm_yday = rem;
+    isLeap = IsLeapYear(gmt->tm_year);
+
+    /* Compute the month and day of month. */
+
+    for (tmp = 1; lastDayOfMonth[isLeap][tmp] < gmt->tm_yday; tmp++) {
+    }
+    gmt->tm_month = --tmp;
+    gmt->tm_mday = gmt->tm_yday - lastDayOfMonth[isLeap][tmp];
+
+    gmt->tm_params.tp_gmt_offset = 0;
+    gmt->tm_params.tp_dst_offset = 0;
+}
+
+
+/*
+ *------------------------------------------------------------------------
+ *
+ * PR_ExplodeTime --
+ *
+ *     Cf. struct tm *gmtime(const time_t *tp) and
+ *         struct tm *localtime(const time_t *tp)
+ *
+ *------------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(void)
+PR_ExplodeTime(
+    PRTime usecs,
+    PRTimeParamFn params,
+    PRExplodedTime *exploded)
+{
+    ComputeGMT(usecs, exploded);
+    exploded->tm_params = params(exploded);
+    ApplySecOffset(exploded, exploded->tm_params.tp_gmt_offset
+                   + exploded->tm_params.tp_dst_offset);
+}
+
+
+/*
+ *------------------------------------------------------------------------
+ *
+ * PR_ImplodeTime --
+ *
+ *     Cf. time_t mktime(struct tm *tp)
+ *     Note that 1 year has < 2^25 seconds.  So an PRInt32 is large enough.
+ *
+ *------------------------------------------------------------------------
+ */
+PR_IMPLEMENT(PRTime)
+PR_ImplodeTime(const PRExplodedTime *exploded)
+{
+    PRExplodedTime copy;
+    PRTime retVal;
+    PRInt64 secPerDay, usecPerSec;
+    PRInt64 temp;
+    PRInt64 numSecs64;
+    PRInt32 numDays;
+    PRInt32 numSecs;
+
+    /* Normalize first.  Do this on our copy */
+    copy = *exploded;
+    PR_NormalizeTime(&copy, PR_GMTParameters);
+
+    numDays = DAYS_BETWEEN_YEARS(1970, copy.tm_year);
+
+    numSecs = copy.tm_yday * 86400 + copy.tm_hour * 3600
+              + copy.tm_min * 60 + copy.tm_sec;
+
+    LL_I2L(temp, numDays);
+    LL_I2L(secPerDay, 86400);
+    LL_MUL(temp, temp, secPerDay);
+    LL_I2L(numSecs64, numSecs);
+    LL_ADD(numSecs64, numSecs64, temp);
+
+    /* apply the GMT and DST offsets */
+    LL_I2L(temp,  copy.tm_params.tp_gmt_offset);
+    LL_SUB(numSecs64, numSecs64, temp);
+    LL_I2L(temp,  copy.tm_params.tp_dst_offset);
+    LL_SUB(numSecs64, numSecs64, temp);
+
+    LL_I2L(usecPerSec, 1000000L);
+    LL_MUL(temp, numSecs64, usecPerSec);
+    LL_I2L(retVal, copy.tm_usec);
+    LL_ADD(retVal, retVal, temp);
+
+    return retVal;
+}
+
+/*
+ *-------------------------------------------------------------------------
+ *
+ * IsLeapYear --
+ *
+ *     Returns 1 if the year is a leap year, 0 otherwise.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+static int IsLeapYear(PRInt16 year)
+{
+    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
+        return 1;
+    }
+    return 0;
+}
+
+/*
+ * 'secOffset' should be less than 86400 (i.e., a day).
+ * 'time' should point to a normalized PRExplodedTime.
+ */
+
+static void
+ApplySecOffset(PRExplodedTime *time, PRInt32 secOffset)
+{
+    time->tm_sec += secOffset;
+
+    /* Note that in this implementation we do not count leap seconds */
+    if (time->tm_sec < 0 || time->tm_sec >= 60) {
+        time->tm_min += time->tm_sec / 60;
+        time->tm_sec %= 60;
+        if (time->tm_sec < 0) {
+            time->tm_sec += 60;
+            time->tm_min--;
+        }
+    }
+
+    if (time->tm_min < 0 || time->tm_min >= 60) {
+        time->tm_hour += time->tm_min / 60;
+        time->tm_min %= 60;
+        if (time->tm_min < 0) {
+            time->tm_min += 60;
+            time->tm_hour--;
+        }
+    }
+
+    if (time->tm_hour < 0) {
+        /* Decrement mday, yday, and wday */
+        time->tm_hour += 24;
+        time->tm_mday--;
+        time->tm_yday--;
+        if (time->tm_mday < 1) {
+            time->tm_month--;
+            if (time->tm_month < 0) {
+                time->tm_month = 11;
+                time->tm_year--;
+                if (IsLeapYear(time->tm_year)) {
+                    time->tm_yday = 365;
+                }
+                else {
+                    time->tm_yday = 364;
+                }
+            }
+            time->tm_mday = nDays[IsLeapYear(time->tm_year)][time->tm_month];
+        }
+        time->tm_wday--;
+        if (time->tm_wday < 0) {
+            time->tm_wday = 6;
+        }
+    } else if (time->tm_hour > 23) {
+        /* Increment mday, yday, and wday */
+        time->tm_hour -= 24;
+        time->tm_mday++;
+        time->tm_yday++;
+        if (time->tm_mday >
+            nDays[IsLeapYear(time->tm_year)][time->tm_month]) {
+            time->tm_mday = 1;
+            time->tm_month++;
+            if (time->tm_month > 11) {
+                time->tm_month = 0;
+                time->tm_year++;
+                time->tm_yday = 0;
+            }
+        }
+        time->tm_wday++;
+        if (time->tm_wday > 6) {
+            time->tm_wday = 0;
+        }
+    }
+}
+
+PR_IMPLEMENT(void)
+PR_NormalizeTime(PRExplodedTime *time, PRTimeParamFn params)
+{
+    int daysInMonth;
+    PRInt32 numDays;
+
+    /* Get back to GMT */
+    time->tm_sec -= time->tm_params.tp_gmt_offset
+                    + time->tm_params.tp_dst_offset;
+    time->tm_params.tp_gmt_offset = 0;
+    time->tm_params.tp_dst_offset = 0;
+
+    /* Now normalize GMT */
+
+    if (time->tm_usec < 0 || time->tm_usec >= 1000000) {
+        time->tm_sec +=  time->tm_usec / 1000000;
+        time->tm_usec %= 1000000;
+        if (time->tm_usec < 0) {
+            time->tm_usec += 1000000;
+            time->tm_sec--;
+        }
+    }
+
+    /* Note that we do not count leap seconds in this implementation */
+    if (time->tm_sec < 0 || time->tm_sec >= 60) {
+        time->tm_min += time->tm_sec / 60;
+        time->tm_sec %= 60;
+        if (time->tm_sec < 0) {
+            time->tm_sec += 60;
+            time->tm_min--;
+        }
+    }
+
+    if (time->tm_min < 0 || time->tm_min >= 60) {
+        time->tm_hour += time->tm_min / 60;
+        time->tm_min %= 60;
+        if (time->tm_min < 0) {
+            time->tm_min += 60;
+            time->tm_hour--;
+        }
+    }
+
+    if (time->tm_hour < 0 || time->tm_hour >= 24) {
+        time->tm_mday += time->tm_hour / 24;
+        time->tm_hour %= 24;
+        if (time->tm_hour < 0) {
+            time->tm_hour += 24;
+            time->tm_mday--;
+        }
+    }
+
+    /* Normalize month and year before mday */
+    if (time->tm_month < 0 || time->tm_month >= 12) {
+        time->tm_year += time->tm_month / 12;
+        time->tm_month %= 12;
+        if (time->tm_month < 0) {
+            time->tm_month += 12;
+            time->tm_year--;
+        }
+    }
+
+    /* Now that month and year are in proper range, normalize mday */
+
+    if (time->tm_mday < 1) {
+        /* mday too small */
+        do {
+            /* the previous month */
+            time->tm_month--;
+            if (time->tm_month < 0) {
+                time->tm_month = 11;
+                time->tm_year--;
+            }
+            time->tm_mday += nDays[IsLeapYear(time->tm_year)][time->tm_month];
+        } while (time->tm_mday < 1);
+    } else {
+        daysInMonth = nDays[IsLeapYear(time->tm_year)][time->tm_month];
+        while (time->tm_mday > daysInMonth) {
+            /* mday too large */
+            time->tm_mday -= daysInMonth;
+            time->tm_month++;
+            if (time->tm_month > 11) {
+                time->tm_month = 0;
+                time->tm_year++;
+            }
+            daysInMonth = nDays[IsLeapYear(time->tm_year)][time->tm_month];
+        }
+    }
+
+    /* Recompute yday and wday */
+    time->tm_yday = time->tm_mday +
+                    lastDayOfMonth[IsLeapYear(time->tm_year)][time->tm_month];
+
+    numDays = DAYS_BETWEEN_YEARS(1970, time->tm_year) + time->tm_yday;
+    time->tm_wday = (numDays + 4) % 7;
+    if (time->tm_wday < 0) {
+        time->tm_wday += 7;
+    }
+
+    /* Recompute time parameters */
+
+    time->tm_params = params(time);
+
+    ApplySecOffset(time, time->tm_params.tp_gmt_offset
+                   + time->tm_params.tp_dst_offset);
+}
+
+
+/*
+ *-------------------------------------------------------------------------
+ *
+ * PR_LocalTimeParameters --
+ *
+ *     returns the time parameters for the local time zone
+ *
+ *     The following uses localtime() from the standard C library.
+ *     (time.h)  This is our fallback implementation.  Unix, PC, and BeOS
+ *     use this version.  A platform may have its own machine-dependent
+ *     implementation of this function.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#if defined(HAVE_INT_LOCALTIME_R)
+
+/*
+ * In this case we could define the macro as
+ *     #define MT_safe_localtime(timer, result) \
+ *             (localtime_r(timer, result) == 0 ? result : NULL)
+ * I chose to compare the return value of localtime_r with -1 so
+ * that I can catch the cases where localtime_r returns a pointer
+ * to struct tm.  The macro definition above would not be able to
+ * detect such mistakes because it is legal to compare a pointer
+ * with 0.
+ */
+
+#define MT_safe_localtime(timer, result) \
+        (localtime_r(timer, result) == -1 ? NULL: result)
+
+#elif defined(HAVE_POINTER_LOCALTIME_R)
+
+#define MT_safe_localtime localtime_r
+
+#elif defined(_MSC_VER)
+
+/* Visual C++ has had localtime_s() since Visual C++ 2005. */
+
+static struct tm *MT_safe_localtime(const time_t *clock, struct tm *result)
+{
+    errno_t err = localtime_s(result, clock);
+    if (err != 0) {
+        errno = err;
+        return NULL;
+    }
+    return result;
+}
+
+#else
+
+#define HAVE_LOCALTIME_MONITOR 1  /* We use 'monitor' to serialize our calls
+                                   * to localtime(). */
+static PRLock *monitor = NULL;
+
+static struct tm *MT_safe_localtime(const time_t *clock, struct tm *result)
+{
+    struct tm *tmPtr;
+    int needLock = PR_Initialized();  /* We need to use a lock to protect
+                                       * against NSPR threads only when the
+                                       * NSPR thread system is activated. */
+
+    if (needLock) {
+        PR_Lock(monitor);
+    }
+
+    /*
+     * Microsoft (all flavors) localtime() returns a NULL pointer if 'clock'
+     * represents a time before midnight January 1, 1970.  In
+     * that case, we also return a NULL pointer and the struct tm
+     * object pointed to by 'result' is not modified.
+     *
+     * Watcom C/C++ 11.0 localtime() treats time_t as unsigned long
+     * hence, does not recognize negative values of clock as pre-1/1/70.
+     * We have to manually check (WIN16 only) for negative value of
+     * clock and return NULL.
+     *
+     * With negative values of clock, OS/2 returns the struct tm for
+     * clock plus ULONG_MAX. So we also have to check for the invalid
+     * structs returned for timezones west of Greenwich when clock == 0.
+     */
+
+    tmPtr = localtime(clock);
+
+#if defined(WIN16) || defined(XP_OS2)
+    if ( (PRInt32) *clock < 0 ||
+         ( (PRInt32) *clock == 0 && tmPtr->tm_year != 70)) {
+        result = NULL;
+    }
+    else {
+        *result = *tmPtr;
+    }
+#else
+    if (tmPtr) {
+        *result = *tmPtr;
+    } else {
+        result = NULL;
+    }
+#endif /* WIN16 */
+
+    if (needLock) {
+        PR_Unlock(monitor);
+    }
+
+    return result;
+}
+
+#endif  /* definition of MT_safe_localtime() */
+
+void _PR_InitTime(void)
+{
+#ifdef HAVE_LOCALTIME_MONITOR
+    monitor = PR_NewLock();
+#endif
+#ifdef WINCE
+    _MD_InitTime();
+#endif
+}
+
+void _PR_CleanupTime(void)
+{
+#ifdef HAVE_LOCALTIME_MONITOR
+    if (monitor) {
+        PR_DestroyLock(monitor);
+        monitor = NULL;
+    }
+#endif
+#ifdef WINCE
+    _MD_CleanupTime();
+#endif
+}
+
+#if defined(XP_UNIX) || defined(XP_PC)
+
+PR_IMPLEMENT(PRTimeParameters)
+PR_LocalTimeParameters(const PRExplodedTime *gmt)
+{
+
+    PRTimeParameters retVal;
+    struct tm localTime;
+    struct tm *localTimeResult;
+    time_t secs;
+    PRTime secs64;
+    PRInt64 usecPerSec;
+    PRInt64 usecPerSec_1;
+    PRInt64 maxInt32;
+    PRInt64 minInt32;
+    PRInt32 dayOffset;
+    PRInt32 offset2Jan1970;
+    PRInt32 offsetNew;
+    int isdst2Jan1970;
+
+    /*
+     * Calculate the GMT offset.  First, figure out what is
+     * 00:00:00 Jan. 2, 1970 GMT (which is exactly a day, or 86400
+     * seconds, since the epoch) in local time.  Then we calculate
+     * the difference between local time and GMT in seconds:
+     *     gmt_offset = local_time - GMT
+     *
+     * Caveat: the validity of this calculation depends on two
+     * assumptions:
+     * 1. Daylight saving time was not in effect on Jan. 2, 1970.
+     * 2. The time zone of the geographic location has not changed
+     *    since Jan. 2, 1970.
+     */
+
+    secs = 86400L;
+    localTimeResult = MT_safe_localtime(&secs, &localTime);
+    PR_ASSERT(localTimeResult != NULL);
+    if (localTimeResult == NULL) {
+        /* Shouldn't happen. Use safe fallback for optimized builds. */
+        return PR_GMTParameters(gmt);
+    }
+
+    /* GMT is 00:00:00, 2nd of Jan. */
+
+    offset2Jan1970 = (PRInt32)localTime.tm_sec
+                     + 60L * (PRInt32)localTime.tm_min
+                     + 3600L * (PRInt32)localTime.tm_hour
+                     + 86400L * (PRInt32)((PRInt32)localTime.tm_mday - 2L);
+
+    isdst2Jan1970 = localTime.tm_isdst;
+
+    /*
+     * Now compute DST offset.  We calculate the overall offset
+     * of local time from GMT, similar to above.  The overall
+     * offset has two components: gmt offset and dst offset.
+     * We subtract gmt offset from the overall offset to get
+     * the dst offset.
+     *     overall_offset = local_time - GMT
+     *     overall_offset = gmt_offset + dst_offset
+     * ==> dst_offset = local_time - GMT - gmt_offset
+     */
+
+    secs64 = PR_ImplodeTime(gmt);    /* This is still in microseconds */
+    LL_I2L(usecPerSec, PR_USEC_PER_SEC);
+    LL_I2L(usecPerSec_1, PR_USEC_PER_SEC - 1);
+    /* Convert to seconds, truncating down (3.1 -> 3 and -3.1 -> -4) */
+    if (LL_GE_ZERO(secs64)) {
+        LL_DIV(secs64, secs64, usecPerSec);
+    } else {
+        LL_NEG(secs64, secs64);
+        LL_ADD(secs64, secs64, usecPerSec_1);
+        LL_DIV(secs64, secs64, usecPerSec);
+        LL_NEG(secs64, secs64);
+    }
+    LL_I2L(maxInt32, PR_INT32_MAX);
+    LL_I2L(minInt32, PR_INT32_MIN);
+    if (LL_CMP(secs64, >, maxInt32) || LL_CMP(secs64, <, minInt32)) {
+        /* secs64 is too large or too small for time_t (32-bit integer) */
+        retVal.tp_gmt_offset = offset2Jan1970;
+        retVal.tp_dst_offset = 0;
+        return retVal;
+    }
+    LL_L2I(secs, secs64);
+
+    /*
+     * On Windows, localtime() (and our MT_safe_localtime() too)
+     * returns a NULL pointer for time before midnight January 1,
+     * 1970 GMT.  In that case, we just use the GMT offset for
+     * Jan 2, 1970 and assume that DST was not in effect.
+     */
+
+    if (MT_safe_localtime(&secs, &localTime) == NULL) {
+        retVal.tp_gmt_offset = offset2Jan1970;
+        retVal.tp_dst_offset = 0;
+        return retVal;
+    }
+
+    /*
+     * dayOffset is the offset between local time and GMT in
+     * the day component, which can only be -1, 0, or 1.  We
+     * use the day of the week to compute dayOffset.
+     */
+
+    dayOffset = (PRInt32) localTime.tm_wday - gmt->tm_wday;
+
+    /*
+     * Need to adjust for wrapping around of day of the week from
+     * 6 back to 0.
+     */
+
+    if (dayOffset == -6) {
+        /* Local time is Sunday (0) and GMT is Saturday (6) */
+        dayOffset = 1;
+    } else if (dayOffset == 6) {
+        /* Local time is Saturday (6) and GMT is Sunday (0) */
+        dayOffset = -1;
+    }
+
+    offsetNew = (PRInt32)localTime.tm_sec - gmt->tm_sec
+                + 60L * ((PRInt32)localTime.tm_min - gmt->tm_min)
+                + 3600L * ((PRInt32)localTime.tm_hour - gmt->tm_hour)
+                + 86400L * (PRInt32)dayOffset;
+
+    if (localTime.tm_isdst <= 0) {
+        /* DST is not in effect */
+        retVal.tp_gmt_offset = offsetNew;
+        retVal.tp_dst_offset = 0;
+    } else {
+        /* DST is in effect */
+        if (isdst2Jan1970 <=0) {
+            /*
+             * DST was not in effect back in 2 Jan. 1970.
+             * Use the offset back then as the GMT offset,
+             * assuming the time zone has not changed since then.
+             */
+            retVal.tp_gmt_offset = offset2Jan1970;
+            retVal.tp_dst_offset = offsetNew - offset2Jan1970;
+        } else {
+            /*
+             * DST was also in effect back in 2 Jan. 1970.
+             * Then our clever trick (or rather, ugly hack) fails.
+             * We will just assume DST offset is an hour.
+             */
+            retVal.tp_gmt_offset = offsetNew - 3600;
+            retVal.tp_dst_offset = 3600;
+        }
+    }
+
+    return retVal;
+}
+
+#endif    /* defined(XP_UNIX) || defined(XP_PC) */
+
+/*
+ *------------------------------------------------------------------------
+ *
+ * PR_USPacificTimeParameters --
+ *
+ *     The time parameters function for the US Pacific Time Zone.
+ *
+ *------------------------------------------------------------------------
+ */
+
+/*
+ * Returns the mday of the first sunday of the month, where
+ * mday and wday are for a given day in the month.
+ * mdays start with 1 (e.g. 1..31).
+ * wdays start with 0 and are in the range 0..6.  0 = Sunday.
+ */
+#define firstSunday(mday, wday) (((mday - wday + 7 - 1) % 7) + 1)
+
+/*
+ * Returns the mday for the N'th Sunday of the month, where
+ * mday and wday are for a given day in the month.
+ * mdays start with 1 (e.g. 1..31).
+ * wdays start with 0 and are in the range 0..6.  0 = Sunday.
+ * N has the following values: 0 = first, 1 = second (etc), -1 = last.
+ * ndays is the number of days in that month, the same value as the
+ * mday of the last day of the month.
+ */
+static PRInt32
+NthSunday(PRInt32 mday, PRInt32 wday, PRInt32 N, PRInt32 ndays)
+{
+    PRInt32 firstSun = firstSunday(mday, wday);
+
+    if (N < 0) {
+        N = (ndays - firstSun) / 7;
+    }
+    return firstSun + (7 * N);
+}
+
+typedef struct DSTParams {
+    PRInt8 dst_start_month;       /* 0 = January */
+    PRInt8 dst_start_Nth_Sunday;  /* N as defined above */
+    PRInt8 dst_start_month_ndays; /* ndays as defined above */
+    PRInt8 dst_end_month;         /* 0 = January */
+    PRInt8 dst_end_Nth_Sunday;    /* N as defined above */
+    PRInt8 dst_end_month_ndays;   /* ndays as defined above */
+} DSTParams;
+
+static const DSTParams dstParams[2] = {
+    /* year < 2007:  First April Sunday - Last October Sunday */
+    { 3, 0, 30, 9, -1, 31 },
+    /* year >= 2007: Second March Sunday - First November Sunday */
+    { 2, 1, 31, 10, 0, 30 }
+};
+
+PR_IMPLEMENT(PRTimeParameters)
+PR_USPacificTimeParameters(const PRExplodedTime *gmt)
+{
+    const DSTParams *dst;
+    PRTimeParameters retVal;
+    PRExplodedTime st;
+
+    /*
+     * Based on geographic location and GMT, figure out offset of
+     * standard time from GMT.  In this example implementation, we
+     * assume the local time zone is US Pacific Time.
+     */
+
+    retVal.tp_gmt_offset = -8L * 3600L;
+
+    /*
+     * Make a copy of GMT.  Note that the tm_params field of this copy
+     * is ignored.
+     */
+
+    st.tm_usec = gmt->tm_usec;
+    st.tm_sec = gmt->tm_sec;
+    st.tm_min = gmt->tm_min;
+    st.tm_hour = gmt->tm_hour;
+    st.tm_mday = gmt->tm_mday;
+    st.tm_month = gmt->tm_month;
+    st.tm_year = gmt->tm_year;
+    st.tm_wday = gmt->tm_wday;
+    st.tm_yday = gmt->tm_yday;
+
+    /* Apply the offset to GMT to obtain the local standard time */
+    ApplySecOffset(&st, retVal.tp_gmt_offset);
+
+    if (st.tm_year < 2007) { /* first April Sunday - Last October Sunday */
+        dst = &dstParams[0];
+    } else {                 /* Second March Sunday - First November Sunday */
+        dst = &dstParams[1];
+    }
+
+    /*
+     * Apply the rules on standard time or GMT to obtain daylight saving
+     * time offset.  In this implementation, we use the US DST rule.
+     */
+    if (st.tm_month < dst->dst_start_month) {
+        retVal.tp_dst_offset = 0L;
+    } else if (st.tm_month == dst->dst_start_month) {
+        int NthSun = NthSunday(st.tm_mday, st.tm_wday,
+                               dst->dst_start_Nth_Sunday,
+                               dst->dst_start_month_ndays);
+        if (st.tm_mday < NthSun) {              /* Before starting Sunday */
+            retVal.tp_dst_offset = 0L;
+        } else if (st.tm_mday == NthSun) {      /* Starting Sunday */
+            /* 01:59:59 PST -> 03:00:00 PDT */
+            if (st.tm_hour < 2) {
+                retVal.tp_dst_offset = 0L;
+            } else {
+                retVal.tp_dst_offset = 3600L;
+            }
+        } else {                                /* After starting Sunday */
+            retVal.tp_dst_offset = 3600L;
+        }
+    } else if (st.tm_month < dst->dst_end_month) {
+        retVal.tp_dst_offset = 3600L;
+    } else if (st.tm_month == dst->dst_end_month) {
+        int NthSun = NthSunday(st.tm_mday, st.tm_wday,
+                               dst->dst_end_Nth_Sunday,
+                               dst->dst_end_month_ndays);
+        if (st.tm_mday < NthSun) {              /* Before ending Sunday */
+            retVal.tp_dst_offset = 3600L;
+        } else if (st.tm_mday == NthSun) {      /* Ending Sunday */
+            /* 01:59:59 PDT -> 01:00:00 PST */
+            if (st.tm_hour < 1) {
+                retVal.tp_dst_offset = 3600L;
+            } else {
+                retVal.tp_dst_offset = 0L;
+            }
+        } else {                                /* After ending Sunday */
+            retVal.tp_dst_offset = 0L;
+        }
+    } else {
+        retVal.tp_dst_offset = 0L;
+    }
+    return retVal;
+}
+
+/*
+ *------------------------------------------------------------------------
+ *
+ * PR_GMTParameters --
+ *
+ *     Returns the PRTimeParameters for Greenwich Mean Time.
+ *     Trivially, both the tp_gmt_offset and tp_dst_offset fields are 0.
+ *
+ *------------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(PRTimeParameters)
+PR_GMTParameters(const PRExplodedTime *gmt)
+{
+    PRTimeParameters retVal = { 0, 0 };
+    return retVal;
+}
+
+/*
+ * The following code implements PR_ParseTimeString().  It is based on
+ * ns/lib/xp/xp_time.c, revision 1.25, by Jamie Zawinski <jwz@netscape.com>.
+ */
+
+/*
+ * We only recognize the abbreviations of a small subset of time zones
+ * in North America, Europe, and Japan.
+ *
+ * PST/PDT: Pacific Standard/Daylight Time
+ * MST/MDT: Mountain Standard/Daylight Time
+ * CST/CDT: Central Standard/Daylight Time
+ * EST/EDT: Eastern Standard/Daylight Time
+ * AST: Atlantic Standard Time
+ * NST: Newfoundland Standard Time
+ * GMT: Greenwich Mean Time
+ * BST: British Summer Time
+ * MET: Middle Europe Time
+ * EET: Eastern Europe Time
+ * JST: Japan Standard Time
+ */
+
+typedef enum
+{
+    TT_UNKNOWN,
+
+    TT_SUN, TT_MON, TT_TUE, TT_WED, TT_THU, TT_FRI, TT_SAT,
+
+    TT_JAN, TT_FEB, TT_MAR, TT_APR, TT_MAY, TT_JUN,
+    TT_JUL, TT_AUG, TT_SEP, TT_OCT, TT_NOV, TT_DEC,
+
+    TT_PST, TT_PDT, TT_MST, TT_MDT, TT_CST, TT_CDT, TT_EST, TT_EDT,
+    TT_AST, TT_NST, TT_GMT, TT_BST, TT_MET, TT_EET, TT_JST
+} TIME_TOKEN;
+
+/*
+ * This parses a time/date string into a PRTime
+ * (microseconds after "1-Jan-1970 00:00:00 GMT").
+ * It returns PR_SUCCESS on success, and PR_FAILURE
+ * if the time/date string can't be parsed.
+ *
+ * Many formats are handled, including:
+ *
+ *   14 Apr 89 03:20:12
+ *   14 Apr 89 03:20 GMT
+ *   Fri, 17 Mar 89 4:01:33
+ *   Fri, 17 Mar 89 4:01 GMT
+ *   Mon Jan 16 16:12 PDT 1989
+ *   Mon Jan 16 16:12 +0130 1989
+ *   6 May 1992 16:41-JST (Wednesday)
+ *   22-AUG-1993 10:59:12.82
+ *   22-AUG-1993 10:59pm
+ *   22-AUG-1993 12:59am
+ *   22-AUG-1993 12:59 PM
+ *   Friday, August 04, 1995 3:54 PM
+ *   06/21/95 04:24:34 PM
+ *   20/06/95 21:07
+ *   95-06-08 19:32:48 EDT
+ *
+ * If the input string doesn't contain a description of the timezone,
+ * we consult the `default_to_gmt' to decide whether the string should
+ * be interpreted relative to the local time zone (PR_FALSE) or GMT (PR_TRUE).
+ * The correct value for this argument depends on what standard specified
+ * the time string which you are parsing.
+ */
+
+PR_IMPLEMENT(PRStatus)
+PR_ParseTimeStringToExplodedTime(
+    const char *string,
+    PRBool default_to_gmt,
+    PRExplodedTime *result)
+{
+    TIME_TOKEN dotw = TT_UNKNOWN;
+    TIME_TOKEN month = TT_UNKNOWN;
+    TIME_TOKEN zone = TT_UNKNOWN;
+    int zone_offset = -1;
+    int dst_offset = 0;
+    int date = -1;
+    PRInt32 year = -1;
+    int hour = -1;
+    int min = -1;
+    int sec = -1;
+    struct tm *localTimeResult;
+
+    const char *rest = string;
+
+    int iterations = 0;
+
+    PR_ASSERT(string && result);
+    if (!string || !result) {
+        return PR_FAILURE;
+    }
+
+    while (*rest)
+    {
+
+        if (iterations++ > 1000)
+        {
+            return PR_FAILURE;
+        }
+
+        switch (*rest)
+        {
+            case 'a': case 'A':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'p' || rest[1] == 'P') &&
+                    (rest[2] == 'r' || rest[2] == 'R')) {
+                    month = TT_APR;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_AST;
+                }
+                else if (month == TT_UNKNOWN &&
+                         (rest[1] == 'u' || rest[1] == 'U') &&
+                         (rest[2] == 'g' || rest[2] == 'G')) {
+                    month = TT_AUG;
+                }
+                break;
+            case 'b': case 'B':
+                if (zone == TT_UNKNOWN &&
+                    (rest[1] == 's' || rest[1] == 'S') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_BST;
+                }
+                break;
+            case 'c': case 'C':
+                if (zone == TT_UNKNOWN &&
+                    (rest[1] == 'd' || rest[1] == 'D') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_CDT;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_CST;
+                }
+                break;
+            case 'd': case 'D':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'e' || rest[1] == 'E') &&
+                    (rest[2] == 'c' || rest[2] == 'C')) {
+                    month = TT_DEC;
+                }
+                break;
+            case 'e': case 'E':
+                if (zone == TT_UNKNOWN &&
+                    (rest[1] == 'd' || rest[1] == 'D') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_EDT;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 'e' || rest[1] == 'E') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_EET;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_EST;
+                }
+                break;
+            case 'f': case 'F':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'e' || rest[1] == 'E') &&
+                    (rest[2] == 'b' || rest[2] == 'B')) {
+                    month = TT_FEB;
+                }
+                else if (dotw == TT_UNKNOWN &&
+                         (rest[1] == 'r' || rest[1] == 'R') &&
+                         (rest[2] == 'i' || rest[2] == 'I')) {
+                    dotw = TT_FRI;
+                }
+                break;
+            case 'g': case 'G':
+                if (zone == TT_UNKNOWN &&
+                    (rest[1] == 'm' || rest[1] == 'M') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_GMT;
+                }
+                break;
+            case 'j': case 'J':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'a' || rest[1] == 'A') &&
+                    (rest[2] == 'n' || rest[2] == 'N')) {
+                    month = TT_JAN;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_JST;
+                }
+                else if (month == TT_UNKNOWN &&
+                         (rest[1] == 'u' || rest[1] == 'U') &&
+                         (rest[2] == 'l' || rest[2] == 'L')) {
+                    month = TT_JUL;
+                }
+                else if (month == TT_UNKNOWN &&
+                         (rest[1] == 'u' || rest[1] == 'U') &&
+                         (rest[2] == 'n' || rest[2] == 'N')) {
+                    month = TT_JUN;
+                }
+                break;
+            case 'm': case 'M':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'a' || rest[1] == 'A') &&
+                    (rest[2] == 'r' || rest[2] == 'R')) {
+                    month = TT_MAR;
+                }
+                else if (month == TT_UNKNOWN &&
+                         (rest[1] == 'a' || rest[1] == 'A') &&
+                         (rest[2] == 'y' || rest[2] == 'Y')) {
+                    month = TT_MAY;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 'd' || rest[1] == 'D') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_MDT;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 'e' || rest[1] == 'E') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_MET;
+                }
+                else if (dotw == TT_UNKNOWN &&
+                         (rest[1] == 'o' || rest[1] == 'O') &&
+                         (rest[2] == 'n' || rest[2] == 'N')) {
+                    dotw = TT_MON;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_MST;
+                }
+                break;
+            case 'n': case 'N':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'o' || rest[1] == 'O') &&
+                    (rest[2] == 'v' || rest[2] == 'V')) {
+                    month = TT_NOV;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_NST;
+                }
+                break;
+            case 'o': case 'O':
+                if (month == TT_UNKNOWN &&
+                    (rest[1] == 'c' || rest[1] == 'C') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    month = TT_OCT;
+                }
+                break;
+            case 'p': case 'P':
+                if (zone == TT_UNKNOWN &&
+                    (rest[1] == 'd' || rest[1] == 'D') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_PDT;
+                }
+                else if (zone == TT_UNKNOWN &&
+                         (rest[1] == 's' || rest[1] == 'S') &&
+                         (rest[2] == 't' || rest[2] == 'T')) {
+                    zone = TT_PST;
+                }
+                break;
+            case 's': case 'S':
+                if (dotw == TT_UNKNOWN &&
+                    (rest[1] == 'a' || rest[1] == 'A') &&
+                    (rest[2] == 't' || rest[2] == 'T')) {
+                    dotw = TT_SAT;
+                }
+                else if (month == TT_UNKNOWN &&
+                         (rest[1] == 'e' || rest[1] == 'E') &&
+                         (rest[2] == 'p' || rest[2] == 'P')) {
+                    month = TT_SEP;
+                }
+                else if (dotw == TT_UNKNOWN &&
+                         (rest[1] == 'u' || rest[1] == 'U') &&
+                         (rest[2] == 'n' || rest[2] == 'N')) {
+                    dotw = TT_SUN;
+                }
+                break;
+            case 't': case 'T':
+                if (dotw == TT_UNKNOWN &&
+                    (rest[1] == 'h' || rest[1] == 'H') &&
+                    (rest[2] == 'u' || rest[2] == 'U')) {
+                    dotw = TT_THU;
+                }
+                else if (dotw == TT_UNKNOWN &&
+                         (rest[1] == 'u' || rest[1] == 'U') &&
+                         (rest[2] == 'e' || rest[2] == 'E')) {
+                    dotw = TT_TUE;
+                }
+                break;
+            case 'u': case 'U':
+                if (zone == TT_UNKNOWN &&
+                    (rest[1] == 't' || rest[1] == 'T') &&
+                    !(rest[2] >= 'A' && rest[2] <= 'Z') &&
+                    !(rest[2] >= 'a' && rest[2] <= 'z'))
+                    /* UT is the same as GMT but UTx is not. */
+                {
+                    zone = TT_GMT;
+                }
+                break;
+            case 'w': case 'W':
+                if (dotw == TT_UNKNOWN &&
+                    (rest[1] == 'e' || rest[1] == 'E') &&
+                    (rest[2] == 'd' || rest[2] == 'D')) {
+                    dotw = TT_WED;
+                }
+                break;
+
+            case '+': case '-':
+            {
+                const char *end;
+                int sign;
+                if (zone_offset != -1)
+                {
+                    /* already got one... */
+                    rest++;
+                    break;
+                }
+                if (zone != TT_UNKNOWN && zone != TT_GMT)
+                {
+                    /* GMT+0300 is legal, but PST+0300 is not. */
+                    rest++;
+                    break;
+                }
+
+                sign = ((*rest == '+') ? 1 : -1);
+                rest++; /* move over sign */
+                end = rest;
+                while (*end >= '0' && *end <= '9') {
+                    end++;
+                }
+                if (rest == end) { /* no digits here */
+                    break;
+                }
+
+                if ((end - rest) == 4)
+                    /* offset in HHMM */
+                    zone_offset = (((((rest[0]-'0')*10) + (rest[1]-'0')) * 60) +
+                                   (((rest[2]-'0')*10) + (rest[3]-'0')));
+                else if ((end - rest) == 2)
+                    /* offset in hours */
+                {
+                    zone_offset = (((rest[0]-'0')*10) + (rest[1]-'0')) * 60;
+                }
+                else if ((end - rest) == 1)
+                    /* offset in hours */
+                {
+                    zone_offset = (rest[0]-'0') * 60;
+                }
+                else
+                    /* 3 or >4 */
+                {
+                    break;
+                }
+
+                zone_offset *= sign;
+                zone = TT_GMT;
+                break;
+            }
+
+            case '0': case '1': case '2': case '3': case '4':
+            case '5': case '6': case '7': case '8': case '9':
+            {
+                int tmp_hour = -1;
+                int tmp_min = -1;
+                int tmp_sec = -1;
+                const char *end = rest + 1;
+                while (*end >= '0' && *end <= '9') {
+                    end++;
+                }
+
+                /* end is now the first character after a range of digits. */
+
+                if (*end == ':')
+                {
+                    if (hour >= 0 && min >= 0) { /* already got it */
+                        break;
+                    }
+
+                    /* We have seen "[0-9]+:", so this is probably HH:MM[:SS] */
+                    if ((end - rest) > 2)
+                        /* it is [0-9][0-9][0-9]+: */
+                    {
+                        break;
+                    }
+                    if ((end - rest) == 2)
+                        tmp_hour = ((rest[0]-'0')*10 +
+                                    (rest[1]-'0'));
+                    else {
+                        tmp_hour = (rest[0]-'0');
+                    }
+
+                    /* move over the colon, and parse minutes */
+
+                    rest = ++end;
+                    while (*end >= '0' && *end <= '9') {
+                        end++;
+                    }
+
+                    if (end == rest)
+                        /* no digits after first colon? */
+                    {
+                        break;
+                    }
+                    if ((end - rest) > 2)
+                        /* it is [0-9][0-9][0-9]+: */
+                    {
+                        break;
+                    }
+                    if ((end - rest) == 2)
+                        tmp_min = ((rest[0]-'0')*10 +
+                                   (rest[1]-'0'));
+                    else {
+                        tmp_min = (rest[0]-'0');
+                    }
+
+                    /* now go for seconds */
+                    rest = end;
+                    if (*rest == ':') {
+                        rest++;
+                    }
+                    end = rest;
+                    while (*end >= '0' && *end <= '9') {
+                        end++;
+                    }
+
+                    if (end == rest)
+                        /* no digits after second colon - that's ok. */
+                        ;
+                    else if ((end - rest) > 2)
+                        /* it is [0-9][0-9][0-9]+: */
+                    {
+                        break;
+                    }
+                    if ((end - rest) == 2)
+                        tmp_sec = ((rest[0]-'0')*10 +
+                                   (rest[1]-'0'));
+                    else {
+                        tmp_sec = (rest[0]-'0');
+                    }
+
+                    /* If we made it here, we've parsed hour and min,
+                       and possibly sec, so it worked as a unit. */
+
+                    /* skip over whitespace and see if there's an AM or PM
+                       directly following the time.
+                     */
+                    if (tmp_hour <= 12)
+                    {
+                        const char *s = end;
+                        while (*s && (*s == ' ' || *s == '\t')) {
+                            s++;
+                        }
+                        if ((s[0] == 'p' || s[0] == 'P') &&
+                            (s[1] == 'm' || s[1] == 'M'))
+                            /* 10:05pm == 22:05, and 12:05pm == 12:05 */
+                        {
+                            tmp_hour = (tmp_hour == 12 ? 12 : tmp_hour + 12);
+                        }
+                        else if (tmp_hour == 12 &&
+                                 (s[0] == 'a' || s[0] == 'A') &&
+                                 (s[1] == 'm' || s[1] == 'M'))
+                            /* 12:05am == 00:05 */
+                        {
+                            tmp_hour = 0;
+                        }
+                    }
+
+                    hour = tmp_hour;
+                    min = tmp_min;
+                    sec = tmp_sec;
+                    rest = end;
+                    break;
+                }
+                if ((*end == '/' || *end == '-') &&
+                    end[1] >= '0' && end[1] <= '9')
+                {
+                    /* Perhaps this is 6/16/95, 16/6/95, 6-16-95, or 16-6-95
+                       or even 95-06-05...
+                       #### But it doesn't handle 1995-06-22.
+                     */
+                    int n1, n2, n3;
+                    const char *s;
+
+                    if (month != TT_UNKNOWN)
+                        /* if we saw a month name, this can't be. */
+                    {
+                        break;
+                    }
+
+                    s = rest;
+
+                    n1 = (*s++ - '0');                                /* first 1 or 2 digits */
+                    if (*s >= '0' && *s <= '9') {
+                        n1 = n1*10 + (*s++ - '0');
+                    }
+
+                    if (*s != '/' && *s != '-') {              /* slash */
+                        break;
+                    }
+                    s++;
+
+                    if (*s < '0' || *s > '9') {              /* second 1 or 2 digits */
+                        break;
+                    }
+                    n2 = (*s++ - '0');
+                    if (*s >= '0' && *s <= '9') {
+                        n2 = n2*10 + (*s++ - '0');
+                    }
+
+                    if (*s != '/' && *s != '-') {              /* slash */
+                        break;
+                    }
+                    s++;
+
+                    if (*s < '0' || *s > '9') {              /* third 1, 2, 4, or 5 digits */
+                        break;
+                    }
+                    n3 = (*s++ - '0');
+                    if (*s >= '0' && *s <= '9') {
+                        n3 = n3*10 + (*s++ - '0');
+                    }
+
+                    if (*s >= '0' && *s <= '9')            /* optional digits 3, 4, and 5 */
+                    {
+                        n3 = n3*10 + (*s++ - '0');
+                        if (*s < '0' || *s > '9') {
+                            break;
+                        }
+                        n3 = n3*10 + (*s++ - '0');
+                        if (*s >= '0' && *s <= '9') {
+                            n3 = n3*10 + (*s++ - '0');
+                        }
+                    }
+
+                    if ((*s >= '0' && *s <= '9') ||        /* followed by non-alphanum */
+                        (*s >= 'A' && *s <= 'Z') ||
+                        (*s >= 'a' && *s <= 'z')) {
+                        break;
+                    }
+
+                    /* Ok, we parsed three 1-2 digit numbers, with / or -
+                       between them.  Now decide what the hell they are
+                       (DD/MM/YY or MM/DD/YY or YY/MM/DD.)
+                     */
+
+                    if (n1 > 31 || n1 == 0)  /* must be YY/MM/DD */
+                    {
+                        if (n2 > 12) {
+                            break;
+                        }
+                        if (n3 > 31) {
+                            break;
+                        }
+                        year = n1;
+                        if (year < 70) {
+                            year += 2000;
+                        }
+                        else if (year < 100) {
+                            year += 1900;
+                        }
+                        month = (TIME_TOKEN)(n2 + ((int)TT_JAN) - 1);
+                        date = n3;
+                        rest = s;
+                        break;
+                    }
+
+                    if (n1 > 12 && n2 > 12)  /* illegal */
+                    {
+                        rest = s;
+                        break;
+                    }
+
+                    if (n3 < 70) {
+                        n3 += 2000;
+                    }
+                    else if (n3 < 100) {
+                        n3 += 1900;
+                    }
+
+                    if (n1 > 12)  /* must be DD/MM/YY */
+                    {
+                        date = n1;
+                        month = (TIME_TOKEN)(n2 + ((int)TT_JAN) - 1);
+                        year = n3;
+                    }
+                    else                  /* assume MM/DD/YY */
+                    {
+                        /* #### In the ambiguous case, should we consult the
+                           locale to find out the local default? */
+                        month = (TIME_TOKEN)(n1 + ((int)TT_JAN) - 1);
+                        date = n2;
+                        year = n3;
+                    }
+                    rest = s;
+                }
+                else if ((*end >= 'A' && *end <= 'Z') ||
+                         (*end >= 'a' && *end <= 'z'))
+                    /* Digits followed by non-punctuation - what's that? */
+                    ;
+                else if ((end - rest) == 5)                /* five digits is a year */
+                    year = (year < 0
+                            ? ((rest[0]-'0')*10000L +
+                               (rest[1]-'0')*1000L +
+                               (rest[2]-'0')*100L +
+                               (rest[3]-'0')*10L +
+                               (rest[4]-'0'))
+                            : year);
+                else if ((end - rest) == 4)                /* four digits is a year */
+                    year = (year < 0
+                            ? ((rest[0]-'0')*1000L +
+                               (rest[1]-'0')*100L +
+                               (rest[2]-'0')*10L +
+                               (rest[3]-'0'))
+                            : year);
+                else if ((end - rest) == 2)                /* two digits - date or year */
+                {
+                    int n = ((rest[0]-'0')*10 +
+                             (rest[1]-'0'));
+                    /* If we don't have a date (day of the month) and we see a number
+                         less than 32, then assume that is the date.
+
+                             Otherwise, if we have a date and not a year, assume this is the
+                             year.  If it is less than 70, then assume it refers to the 21st
+                             century.  If it is two digits (>= 70), assume it refers to this
+                             century.  Otherwise, assume it refers to an unambiguous year.
+
+                             The world will surely end soon.
+                       */
+                    if (date < 0 && n < 32) {
+                        date = n;
+                    }
+                    else if (year < 0)
+                    {
+                        if (n < 70) {
+                            year = 2000 + n;
+                        }
+                        else if (n < 100) {
+                            year = 1900 + n;
+                        }
+                        else {
+                            year = n;
+                        }
+                    }
+                    /* else what the hell is this. */
+                }
+                else if ((end - rest) == 1) {              /* one digit - date */
+                    date = (date < 0 ? (rest[0]-'0') : date);
+                }
+                /* else, three or more than five digits - what's that? */
+
+                break;
+            }
+        }
+
+        /* Skip to the end of this token, whether we parsed it or not.
+               Tokens are delimited by whitespace, or ,;-/
+               But explicitly not :+-.
+         */
+        while (*rest &&
+               *rest != ' ' && *rest != '\t' &&
+               *rest != ',' && *rest != ';' &&
+               *rest != '-' && *rest != '+' &&
+               *rest != '/' &&
+               *rest != '(' && *rest != ')' && *rest != '[' && *rest != ']') {
+            rest++;
+        }
+        /* skip over uninteresting chars. */
+SKIP_MORE:
+        while (*rest &&
+               (*rest == ' ' || *rest == '\t' ||
+                *rest == ',' || *rest == ';' || *rest == '/' ||
+                *rest == '(' || *rest == ')' || *rest == '[' || *rest == ']')) {
+            rest++;
+        }
+
+        /* "-" is ignored at the beginning of a token if we have not yet
+               parsed a year (e.g., the second "-" in "30-AUG-1966"), or if
+               the character after the dash is not a digit. */
+        if (*rest == '-' && ((rest > string &&
+                              isalpha((unsigned char)rest[-1]) && year < 0) ||
+                             rest[1] < '0' || rest[1] > '9'))
+        {
+            rest++;
+            goto SKIP_MORE;
+        }
+
+    }
+
+    if (zone != TT_UNKNOWN && zone_offset == -1)
+    {
+        switch (zone)
+        {
+            case TT_PST: zone_offset = -8 * 60; break;
+            case TT_PDT: zone_offset = -8 * 60; dst_offset = 1 * 60; break;
+            case TT_MST: zone_offset = -7 * 60; break;
+            case TT_MDT: zone_offset = -7 * 60; dst_offset = 1 * 60; break;
+            case TT_CST: zone_offset = -6 * 60; break;
+            case TT_CDT: zone_offset = -6 * 60; dst_offset = 1 * 60; break;
+            case TT_EST: zone_offset = -5 * 60; break;
+            case TT_EDT: zone_offset = -5 * 60; dst_offset = 1 * 60; break;
+            case TT_AST: zone_offset = -4 * 60; break;
+            case TT_NST: zone_offset = -3 * 60 - 30; break;
+            case TT_GMT: zone_offset =  0 * 60; break;
+            case TT_BST: zone_offset =  0 * 60; dst_offset = 1 * 60; break;
+            case TT_MET: zone_offset =  1 * 60; break;
+            case TT_EET: zone_offset =  2 * 60; break;
+            case TT_JST: zone_offset =  9 * 60; break;
+            default:
+                PR_ASSERT (0);
+                break;
+        }
+    }
+
+    /* If we didn't find a year, month, or day-of-the-month, we can't
+           possibly parse this, and in fact, mktime() will do something random
+           (I'm seeing it return "Tue Feb  5 06:28:16 2036", which is no doubt
+           a numerologically significant date... */
+    if (month == TT_UNKNOWN || date == -1 || year == -1 || year > PR_INT16_MAX) {
+        return PR_FAILURE;
+    }
+
+    memset(result, 0, sizeof(*result));
+    if (sec != -1) {
+        result->tm_sec = sec;
+    }
+    if (min != -1) {
+        result->tm_min = min;
+    }
+    if (hour != -1) {
+        result->tm_hour = hour;
+    }
+    if (date != -1) {
+        result->tm_mday = date;
+    }
+    if (month != TT_UNKNOWN) {
+        result->tm_month = (((int)month) - ((int)TT_JAN));
+    }
+    if (year != -1) {
+        result->tm_year = year;
+    }
+    if (dotw != TT_UNKNOWN) {
+        result->tm_wday = (((int)dotw) - ((int)TT_SUN));
+    }
+    /*
+     * Mainly to compute wday and yday, but normalized time is also required
+     * by the check below that works around a Visual C++ 2005 mktime problem.
+     */
+    PR_NormalizeTime(result, PR_GMTParameters);
+    /* The remaining work is to set the gmt and dst offsets in tm_params. */
+
+    if (zone == TT_UNKNOWN && default_to_gmt)
+    {
+        /* No zone was specified, so pretend the zone was GMT. */
+        zone = TT_GMT;
+        zone_offset = 0;
+    }
+
+    if (zone_offset == -1)
+    {
+        /* no zone was specified, and we're to assume that everything
+          is local. */
+        struct tm localTime;
+        time_t secs;
+
+        PR_ASSERT(result->tm_month > -1 &&
+                  result->tm_mday > 0 &&
+                  result->tm_hour > -1 &&
+                  result->tm_min > -1 &&
+                  result->tm_sec > -1);
+
+        /*
+         * To obtain time_t from a tm structure representing the local
+         * time, we call mktime().  However, we need to see if we are
+         * on 1-Jan-1970 or before.  If we are, we can't call mktime()
+         * because mktime() will crash on win16. In that case, we
+         * calculate zone_offset based on the zone offset at
+         * 00:00:00, 2 Jan 1970 GMT, and subtract zone_offset from the
+         * date we are parsing to transform the date to GMT.  We also
+         * do so if mktime() returns (time_t) -1 (time out of range).
+        */
+
+        /* month, day, hours, mins and secs are always non-negative
+           so we dont need to worry about them. */
+        if(result->tm_year >= 1970)
+        {
+            PRInt64 usec_per_sec;
+
+            localTime.tm_sec = result->tm_sec;
+            localTime.tm_min = result->tm_min;
+            localTime.tm_hour = result->tm_hour;
+            localTime.tm_mday = result->tm_mday;
+            localTime.tm_mon = result->tm_month;
+            localTime.tm_year = result->tm_year - 1900;
+            /* Set this to -1 to tell mktime "I don't care".  If you set
+               it to 0 or 1, you are making assertions about whether the
+               date you are handing it is in daylight savings mode or not;
+               and if you're wrong, it will "fix" it for you. */
+            localTime.tm_isdst = -1;
+
+#if _MSC_VER == 1400  /* 1400 = Visual C++ 2005 (8.0) */
+            /*
+             * mktime will return (time_t) -1 if the input is a date
+             * after 23:59:59, December 31, 3000, US Pacific Time (not
+             * UTC as documented):
+             * http://msdn.microsoft.com/en-us/library/d1y53h2a(VS.80).aspx
+             * But if the year is 3001, mktime also invokes the invalid
+             * parameter handler, causing the application to crash.  This
+             * problem has been reported in
+             * http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=266036.
+             * We avoid this crash by not calling mktime if the date is
+             * out of range.  To use a simple test that works in any time
+             * zone, we consider year 3000 out of range as well.  (See
+             * bug 480740.)
+             */
+            if (result->tm_year >= 3000) {
+                /* Emulate what mktime would have done. */
+                errno = EINVAL;
+                secs = (time_t) -1;
+            } else {
+                secs = mktime(&localTime);
+            }
+#else
+            secs = mktime(&localTime);
+#endif
+            if (secs != (time_t) -1)
+            {
+                PRTime usecs64;
+                LL_I2L(usecs64, secs);
+                LL_I2L(usec_per_sec, PR_USEC_PER_SEC);
+                LL_MUL(usecs64, usecs64, usec_per_sec);
+                PR_ExplodeTime(usecs64, PR_LocalTimeParameters, result);
+                return PR_SUCCESS;
+            }
+        }
+
+        /* So mktime() can't handle this case.  We assume the
+           zone_offset for the date we are parsing is the same as
+           the zone offset on 00:00:00 2 Jan 1970 GMT. */
+        secs = 86400;
+        localTimeResult = MT_safe_localtime(&secs, &localTime);
+        PR_ASSERT(localTimeResult != NULL);
+        if (localTimeResult == NULL) {
+            return PR_FAILURE;
+        }
+        zone_offset = localTime.tm_min
+                      + 60 * localTime.tm_hour
+                      + 1440 * (localTime.tm_mday - 2);
+    }
+
+    result->tm_params.tp_gmt_offset = zone_offset * 60;
+    result->tm_params.tp_dst_offset = dst_offset * 60;
+
+    return PR_SUCCESS;
+}
+
+PR_IMPLEMENT(PRStatus)
+PR_ParseTimeString(
+    const char *string,
+    PRBool default_to_gmt,
+    PRTime *result)
+{
+    PRExplodedTime tm;
+    PRStatus rv;
+
+    rv = PR_ParseTimeStringToExplodedTime(string,
+                                          default_to_gmt,
+                                          &tm);
+    if (rv != PR_SUCCESS) {
+        return rv;
+    }
+
+    *result = PR_ImplodeTime(&tm);
+
+    return PR_SUCCESS;
+}
+
+/*
+ *******************************************************************
+ *******************************************************************
+ **
+ **    OLD COMPATIBILITY FUNCTIONS
+ **
+ *******************************************************************
+ *******************************************************************
+ */
+
+
+/*
+ *-----------------------------------------------------------------------
+ *
+ * PR_FormatTime --
+ *
+ *     Format a time value into a buffer. Same semantics as strftime().
+ *
+ *-----------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(PRUint32)
+PR_FormatTime(char *buf, int buflen, const char *fmt,
+              const PRExplodedTime *time)
+{
+    size_t rv;
+    struct tm a;
+    struct tm *ap;
+
+    if (time) {
+        ap = &a;
+        a.tm_sec = time->tm_sec;
+        a.tm_min = time->tm_min;
+        a.tm_hour = time->tm_hour;
+        a.tm_mday = time->tm_mday;
+        a.tm_mon = time->tm_month;
+        a.tm_wday = time->tm_wday;
+        a.tm_year = time->tm_year - 1900;
+        a.tm_yday = time->tm_yday;
+        a.tm_isdst = time->tm_params.tp_dst_offset ? 1 : 0;
+
+        /*
+         * On some platforms, for example SunOS 4, struct tm has two
+         * additional fields: tm_zone and tm_gmtoff.
+         */
+
+#if (__GLIBC__ >= 2) || defined(NETBSD) \
+        || defined(OPENBSD) || defined(FREEBSD) \
+        || defined(DARWIN) || defined(ANDROID)
+        a.tm_zone = NULL;
+        a.tm_gmtoff = time->tm_params.tp_gmt_offset +
+                      time->tm_params.tp_dst_offset;
+#endif
+    } else {
+        ap = NULL;
+    }
+
+    rv = strftime(buf, buflen, fmt, ap);
+    if (!rv && buf && buflen > 0) {
+        /*
+         * When strftime fails, the contents of buf are indeterminate.
+         * Some callers don't check the return value from this function,
+         * so store an empty string in buf in case they try to print it.
+         */
+        buf[0] = '\0';
+    }
+    return rv;
+}
+
+
+/*
+ * The following string arrays and macros are used by PR_FormatTimeUSEnglish().
+ */
+
+static const char* abbrevDays[] =
+{
+    "Sun","Mon","Tue","Wed","Thu","Fri","Sat"
+};
+
+static const char* days[] =
+{
+    "Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"
+};
+
+static const char* abbrevMonths[] =
+{
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static const char* months[] =
+{
+    "January", "February", "March", "April", "May", "June",
+    "July", "August", "September", "October", "November", "December"
+};
+
+
+/*
+ * Add a single character to the given buffer, incrementing the buffer pointer
+ * and decrementing the buffer size. Return 0 on error.
+ */
+#define ADDCHAR( buf, bufSize, ch )             \
+do                                              \
+{                                               \
+   if( bufSize < 1 )                            \
+   {                                            \
+      *(--buf) = '\0';                          \
+      return 0;                                 \
+   }                                            \
+   *buf++ = ch;                                 \
+   bufSize--;                                   \
+}                                               \
+while(0)
+
+
+/*
+ * Add a string to the given buffer, incrementing the buffer pointer
+ * and decrementing the buffer size appropriately.  Return 0 on error.
+ */
+#define ADDSTR( buf, bufSize, str )             \
+do                                              \
+{                                               \
+   PRUint32 strSize = strlen( str );              \
+   if( strSize > bufSize )                      \
+   {                                            \
+      if( bufSize==0 )                          \
+         *(--buf) = '\0';                       \
+      else                                      \
+         *buf = '\0';                           \
+      return 0;                                 \
+   }                                            \
+   memcpy(buf, str, strSize);                   \
+   buf += strSize;                              \
+   bufSize -= strSize;                          \
+}                                               \
+while(0)
+
+/* Needed by PR_FormatTimeUSEnglish() */
+static unsigned int  pr_WeekOfYear(const PRExplodedTime* time,
+                                   unsigned int firstDayOfWeek);
+
+
+/***********************************************************************************
+ *
+ * Description:
+ *  This is a dumbed down version of strftime that will format the date in US
+ *  English regardless of the setting of the global locale.  This functionality is
+ *  needed to write things like MIME headers which must always be in US English.
+ *
+ **********************************************************************************/
+
+PR_IMPLEMENT(PRUint32)
+PR_FormatTimeUSEnglish( char* buf, PRUint32 bufSize,
+                        const char* format, const PRExplodedTime* time )
+{
+    char*         bufPtr = buf;
+    const char*   fmtPtr;
+    char          tmpBuf[ 40 ];
+    const int     tmpBufSize = sizeof( tmpBuf );
+
+
+    for( fmtPtr=format; *fmtPtr != '\0'; fmtPtr++ )
+    {
+        if( *fmtPtr != '%' )
+        {
+            ADDCHAR( bufPtr, bufSize, *fmtPtr );
+        }
+        else
+        {
+            switch( *(++fmtPtr) )
+            {
+                case '%':
+                    /* escaped '%' character */
+                    ADDCHAR( bufPtr, bufSize, '%' );
+                    break;
+
+                case 'a':
+                    /* abbreviated weekday name */
+                    ADDSTR( bufPtr, bufSize, abbrevDays[ time->tm_wday ] );
+                    break;
+
+                case 'A':
+                    /* full weekday name */
+                    ADDSTR( bufPtr, bufSize, days[ time->tm_wday ] );
+                    break;
+
+                case 'b':
+                    /* abbreviated month name */
+                    ADDSTR( bufPtr, bufSize, abbrevMonths[ time->tm_month ] );
+                    break;
+
+                case 'B':
+                    /* full month name */
+                    ADDSTR(bufPtr, bufSize,  months[ time->tm_month ] );
+                    break;
+
+                case 'c':
+                    /* Date and time. */
+                    PR_FormatTimeUSEnglish( tmpBuf, tmpBufSize, "%a %b %d %H:%M:%S %Y", time );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'd':
+                    /* day of month ( 01 - 31 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2ld",time->tm_mday );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'H':
+                    /* hour ( 00 - 23 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2ld",time->tm_hour );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'I':
+                    /* hour ( 01 - 12 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2ld",
+                                (time->tm_hour%12) ? time->tm_hour%12 : (PRInt32) 12 );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'j':
+                    /* day number of year ( 001 - 366 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.3d",time->tm_yday + 1);
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'm':
+                    /* month number ( 01 - 12 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2ld",time->tm_month+1);
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'M':
+                    /* minute ( 00 - 59 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2ld",time->tm_min );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'p':
+                    /* locale's equivalent of either AM or PM */
+                    ADDSTR( bufPtr, bufSize, (time->tm_hour<12)?"AM":"PM" );
+                    break;
+
+                case 'S':
+                    /* seconds ( 00 - 61 ), allows for leap seconds */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2ld",time->tm_sec );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'U':
+                    /* week number of year ( 00 - 53  ),  Sunday  is  the first day of week 1 */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2d", pr_WeekOfYear( time, 0 ) );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'w':
+                    /* weekday number ( 0 - 6 ), Sunday = 0 */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%d",time->tm_wday );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'W':
+                    /* Week number of year ( 00 - 53  ),  Monday  is  the first day of week 1 */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2d", pr_WeekOfYear( time, 1 ) );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'x':
+                    /* Date representation */
+                    PR_FormatTimeUSEnglish( tmpBuf, tmpBufSize, "%m/%d/%y", time );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'X':
+                    /* Time representation. */
+                    PR_FormatTimeUSEnglish( tmpBuf, tmpBufSize, "%H:%M:%S", time );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'y':
+                    /* year within century ( 00 - 99 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.2d",time->tm_year % 100 );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'Y':
+                    /* year as ccyy ( for example 1986 ) */
+                    PR_snprintf(tmpBuf,tmpBufSize,"%.4d",time->tm_year );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                case 'Z':
+                    /* Time zone name or no characters if  no  time  zone exists.
+                     * Since time zone name is supposed to be independant of locale, we
+                     * defer to PR_FormatTime() for this option.
+                     */
+                    PR_FormatTime( tmpBuf, tmpBufSize, "%Z", time );
+                    ADDSTR( bufPtr, bufSize, tmpBuf );
+                    break;
+
+                default:
+                    /* Unknown format.  Simply copy format into output buffer. */
+                    ADDCHAR( bufPtr, bufSize, '%' );
+                    ADDCHAR( bufPtr, bufSize, *fmtPtr );
+                    break;
+
+            }
+        }
+    }
+
+    ADDCHAR( bufPtr, bufSize, '\0' );
+    return (PRUint32)(bufPtr - buf - 1);
+}
+
+
+
+/***********************************************************************************
+ *
+ * Description:
+ *  Returns the week number of the year (0-53) for the given time.  firstDayOfWeek
+ *  is the day on which the week is considered to start (0=Sun, 1=Mon, ...).
+ *  Week 1 starts the first time firstDayOfWeek occurs in the year.  In other words,
+ *  a partial week at the start of the year is considered week 0.
+ *
+ **********************************************************************************/
+
+static unsigned int
+pr_WeekOfYear(const PRExplodedTime* time, unsigned int firstDayOfWeek)
+{
+    int dayOfWeek;
+    int dayOfYear;
+
+    /* Get the day of the year for the given time then adjust it to represent the
+     * first day of the week containing the given time.
+     */
+    dayOfWeek = time->tm_wday - firstDayOfWeek;
+    if (dayOfWeek < 0) {
+        dayOfWeek += 7;
+    }
+
+    dayOfYear = time->tm_yday - dayOfWeek;
+
+    if( dayOfYear <= 0 )
+    {
+        /* If dayOfYear is <= 0, it is in the first partial week of the year. */
+        return 0;
+    }
+
+    /* Count the number of full weeks ( dayOfYear / 7 ) then add a week if there
+     * are any days left over ( dayOfYear % 7 ).  Because we are only counting to
+     * the first day of the week containing the given time, rather than to the
+     * actual day representing the given time, any days in week 0 will be "absorbed"
+     * as extra days in the given week.
+     */
+    return (dayOfYear / 7) + ( (dayOfYear % 7) == 0 ? 0 : 1 );
+
+}
+