path: root/nsprpub/pr/tests/timetest.c

/* -*- 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/. */

/*
 * file: timetest.c
 * description: test time and date routines
 */
/***********************************************************************
** Includes
***********************************************************************/
/* Used to get the command line option */
#include "plgetopt.h"

#include "prinit.h"
#include "prtime.h"
#include "prprf.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int failed_already=0;
PRBool debug_mode = PR_FALSE;

static char *dayOfWeek[] =
{ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "???" };
static char *month[] =
{   "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "???"
};

static void PrintExplodedTime(const PRExplodedTime *et) {
    PRInt32 totalOffset;
    PRInt32 hourOffset, minOffset;
    const char *sign;

    /* Print day of the week, month, day, hour, minute, and second */
    if (debug_mode) printf("%s %s %ld %02ld:%02ld:%02ld ",
                               dayOfWeek[et->tm_wday], month[et->tm_month], et->tm_mday,
                               et->tm_hour, et->tm_min, et->tm_sec);

    /* Print time zone */
    totalOffset = et->tm_params.tp_gmt_offset + et->tm_params.tp_dst_offset;
    if (totalOffset == 0) {
        if (debug_mode) {
            printf("UTC ");
        }
    } else {
        sign = "+";
        if (totalOffset < 0) {
            totalOffset = -totalOffset;
            sign = "-";
        }
        hourOffset = totalOffset / 3600;
        minOffset = (totalOffset % 3600) / 60;
        if (debug_mode) {
            printf("%s%02ld%02ld ", sign, hourOffset, minOffset);
        }
    }

    /* Print year */
    if (debug_mode) {
        printf("%hd", et->tm_year);
    }
}

static int ExplodedTimeIsEqual(const PRExplodedTime *et1,
                               const PRExplodedTime *et2)
{
    if (et1->tm_usec == et2->tm_usec &&
        et1->tm_sec == et2->tm_sec &&
        et1->tm_min == et2->tm_min &&
        et1->tm_hour == et2->tm_hour &&
        et1->tm_mday == et2->tm_mday &&
        et1->tm_month == et2->tm_month &&
        et1->tm_year == et2->tm_year &&
        et1->tm_wday == et2->tm_wday &&
        et1->tm_yday == et2->tm_yday &&
        et1->tm_params.tp_gmt_offset == et2->tm_params.tp_gmt_offset &&
        et1->tm_params.tp_dst_offset == et2->tm_params.tp_dst_offset) {
        return 1;
    } else {
        return 0;
    }
}

static void
testParseTimeString(PRTime t)
{
    PRExplodedTime et;
    PRTime t2;
    char timeString[128];
    char buf[128];
    PRInt32 totalOffset;
    PRInt32 hourOffset, minOffset;
    const char *sign;
    PRInt64 usec_per_sec;

    /* Truncate the microsecond part of PRTime */
    LL_I2L(usec_per_sec, PR_USEC_PER_SEC);
    LL_DIV(t, t, usec_per_sec);
    LL_MUL(t, t, usec_per_sec);

    PR_ExplodeTime(t, PR_LocalTimeParameters, &et);

    /* Print day of the week, month, day, hour, minute, and second */
    PR_snprintf(timeString, 128, "%s %s %ld %02ld:%02ld:%02ld ",
                dayOfWeek[et.tm_wday], month[et.tm_month], et.tm_mday,
                et.tm_hour, et.tm_min, et.tm_sec);
    /* Print time zone */
    totalOffset = et.tm_params.tp_gmt_offset + et.tm_params.tp_dst_offset;
    if (totalOffset == 0) {
        strcat(timeString, "GMT ");  /* I wanted to use "UTC" here, but
                                      * PR_ParseTimeString doesn't
                                      * understand "UTC".  */
    } else {
        sign = "+";
        if (totalOffset < 0) {
            totalOffset = -totalOffset;
            sign = "-";
        }
        hourOffset = totalOffset / 3600;
        minOffset = (totalOffset % 3600) / 60;
        PR_snprintf(buf, 128, "%s%02ld%02ld ", sign, hourOffset, minOffset);
        strcat(timeString, buf);
    }
    /* Print year */
    PR_snprintf(buf, 128, "%hd", et.tm_year);
    strcat(timeString, buf);

    if (PR_ParseTimeString(timeString, PR_FALSE, &t2) == PR_FAILURE) {
        fprintf(stderr, "PR_ParseTimeString() failed\n");
        exit(1);
    }
    if (LL_NE(t, t2)) {
        fprintf(stderr, "PR_ParseTimeString() incorrect\n");
        PR_snprintf(buf, 128, "t is %lld, t2 is %lld, time string is %s\n",
                    t, t2, timeString);
        fprintf(stderr, "%s\n", buf);
        exit(1);
    }
}

int main(int argc, char** argv)
{
    /* The command line argument: -d is used to determine if the test is being run
    in debug mode. The regress tool requires only one line output:PASS or FAIL.
    All of the printfs associated with this test has been handled with a if (debug_mode)
    test.
    Usage: test_name -d
    */
    PLOptStatus os;
    PLOptState *opt;

    PR_STDIO_INIT();
    opt = PL_CreateOptState(argc, argv, "d");
    while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
    {
        if (PL_OPT_BAD == os) {
            continue;
        }
        switch (opt->option)
        {
            case 'd':  /* debug mode */
                debug_mode = PR_TRUE;
                break;
            default:
                break;
        }
    }
    PL_DestroyOptState(opt);

    /* main test */

    PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);

    /* Testing zero PRTime (the epoch) */
    {
        PRTime t;
        PRExplodedTime et;

        LL_I2L(t, 0);
        if (debug_mode) {
            printf("The NSPR epoch is:\n");
        }
        PR_ExplodeTime(t, PR_LocalTimeParameters, &et);
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf("\n");
        }
        PR_ExplodeTime(t, PR_GMTParameters, &et);
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf("\n\n");
        }
        testParseTimeString(t);
    }

    /*
     *************************************************************
     **
     **  Testing PR_Now(), PR_ExplodeTime, and PR_ImplodeTime
     **  on the current time
     **
     *************************************************************
     */

    {
        PRTime t1, t2;
        PRExplodedTime et;

        if (debug_mode) {
            printf("*********************************************\n");
            printf("**                                         **\n");
            printf("** Testing PR_Now(), PR_ExplodeTime, and   **\n");
            printf("** PR_ImplodeTime on the current time      **\n");
            printf("**                                         **\n");
            printf("*********************************************\n\n");
        }
        t1 = PR_Now();

        /* First try converting to UTC */

        PR_ExplodeTime(t1, PR_GMTParameters, &et);
        if (et.tm_params.tp_gmt_offset || et.tm_params.tp_dst_offset) {
            if (debug_mode) {
                printf("ERROR: UTC has nonzero gmt or dst offset.\n");
            }
            else {
                failed_already=1;
            }
            return 1;
        }
        if (debug_mode) {
            printf("Current UTC is ");
        }
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf("\n");
        }

        t2 = PR_ImplodeTime(&et);
        if (LL_NE(t1, t2)) {
            if (debug_mode) {
                printf("ERROR: Explode and implode are NOT inverse.\n");
            }
            else {
                printf("FAIL\n");
            }
            return 1;
        }

        /* Next, try converting to local (US Pacific) time */

        PR_ExplodeTime(t1, PR_LocalTimeParameters, &et);
        if (debug_mode) {
            printf("Current local time is ");
        }
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf("\n");
        }
        if (debug_mode) printf("GMT offset is %ld, DST offset is %ld\n",
                                   et.tm_params.tp_gmt_offset, et.tm_params.tp_dst_offset);
        t2 = PR_ImplodeTime(&et);
        if (LL_NE(t1, t2)) {
            if (debug_mode) {
                printf("ERROR: Explode and implode are NOT inverse.\n");
            }
            return 1;
        }

        if (debug_mode) {
            printf("Please examine the results\n");
        }
        testParseTimeString(t1);
    }


    /*
     *******************************************
     **
     ** Testing PR_NormalizeTime()
     **
     *******************************************
     */

    /* July 4, 2001 is Wednesday */
    {
        PRExplodedTime et;

        if (debug_mode)  {
            printf("\n");
            printf("**********************************\n");
            printf("**                              **\n");
            printf("** Testing PR_NormalizeTime()   **\n");
            printf("**                              **\n");
            printf("**********************************\n\n");
        }
        et.tm_year    = 2001;
        et.tm_month   = 7 - 1;
        et.tm_mday    = 4;
        et.tm_hour    = 0;
        et.tm_min     = 0;
        et.tm_sec     = 0;
        et.tm_usec    = 0;
        et.tm_params  = PR_GMTParameters(&et);

        PR_NormalizeTime(&et, PR_GMTParameters);

        if (debug_mode) {
            printf("July 4, 2001 is %s.\n", dayOfWeek[et.tm_wday]);
        }
        if (et.tm_wday == 3) {
            if (debug_mode) {
                printf("PASS\n");
            }
        } else {
            if (debug_mode) {
                printf("ERROR: It should be Wednesday\n");
            }
            else {
                failed_already=1;
            }
            return 1;
        }
        testParseTimeString(PR_ImplodeTime(&et));

        /* June 12, 1997 23:00 PST == June 13, 1997 00:00 PDT */
        et.tm_year    = 1997;
        et.tm_month   = 6 - 1;
        et.tm_mday    = 12;
        et.tm_hour    = 23;
        et.tm_min     = 0;
        et.tm_sec     = 0;
        et.tm_usec    = 0;
        et.tm_params.tp_gmt_offset = -8 * 3600;
        et.tm_params.tp_dst_offset = 0;

        PR_NormalizeTime(&et, PR_USPacificTimeParameters);

        if (debug_mode) {
            printf("Thu Jun 12, 1997 23:00:00 PST is ");
        }
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf(".\n");
        }
        if (et.tm_wday == 5) {
            if (debug_mode) {
                printf("PASS\n");
            }
        } else {
            if (debug_mode) {
                printf("ERROR: It should be Friday\n");
            }
            else {
                failed_already=1;
            }
            return 1;
        }
        testParseTimeString(PR_ImplodeTime(&et));

        /* Feb 14, 1997 00:00:00 PDT == Feb 13, 1997 23:00:00 PST */
        et.tm_year    = 1997;
        et.tm_month   = 2 - 1;
        et.tm_mday    = 14;
        et.tm_hour    = 0;
        et.tm_min     = 0;
        et.tm_sec     = 0;
        et.tm_usec    = 0;
        et.tm_params.tp_gmt_offset = -8 * 3600;
        et.tm_params.tp_dst_offset = 3600;

        PR_NormalizeTime(&et, PR_USPacificTimeParameters);

        if (debug_mode) {
            printf("Fri Feb 14, 1997 00:00:00 PDT is ");
        }
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf(".\n");
        }
        if (et.tm_wday == 4) {
            if (debug_mode) {
                printf("PASS\n");
            }
        } else {
            if (debug_mode) {
                printf("ERROR: It should be Thursday\n");
            }
            else {
                failed_already=1;
            }
            return 1;
        }
        testParseTimeString(PR_ImplodeTime(&et));

        /* What time is Nov. 7, 1996, 18:29:23 PDT? */
        et.tm_year    = 1996;
        et.tm_month   = 11 - 1;
        et.tm_mday    = 7;
        et.tm_hour    = 18;
        et.tm_min     = 29;
        et.tm_sec     = 23;
        et.tm_usec    = 0;
        et.tm_params.tp_gmt_offset = -8 * 3600;  /* PDT */
        et.tm_params.tp_dst_offset = 3600;

        PR_NormalizeTime(&et, PR_LocalTimeParameters);
        if (debug_mode) {
            printf("Nov 7 18:29:23 PDT 1996 is ");
        }
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf(".\n");
        }
        testParseTimeString(PR_ImplodeTime(&et));

        /* What time is Oct. 7, 1995, 18:29:23 PST? */
        et.tm_year    = 1995;
        et.tm_month   = 10 - 1;
        et.tm_mday    = 7;
        et.tm_hour    = 18;
        et.tm_min     = 29;
        et.tm_sec     = 23;
        et.tm_params.tp_gmt_offset = -8 * 3600;  /* PST */
        et.tm_params.tp_dst_offset = 0;

        PR_NormalizeTime(&et, PR_LocalTimeParameters);
        if (debug_mode) {
            printf("Oct 7 18:29:23 PST 1995 is ");
        }
        PrintExplodedTime(&et);
        if (debug_mode) {
            printf(".\n");
        }
        testParseTimeString(PR_ImplodeTime(&et));

        if (debug_mode) {
            printf("Please examine the results\n");
        }
    }

    /*
     **************************************************************
     **
     ** Testing range of years
     **
     **************************************************************
     */

    {
        PRExplodedTime et1, et2;
        PRTime  ttt;
        PRTime secs;

        if (debug_mode) {
            printf("\n");
            printf("***************************************\n");
            printf("**                                   **\n");
            printf("**  Testing range of years           **\n");
            printf("**                                   **\n");
            printf("***************************************\n\n");
        }
        /* April 4, 1917 GMT */
        et1.tm_usec = 0;
        et1.tm_sec = 0;
        et1.tm_min = 0;
        et1.tm_hour = 0;
        et1.tm_mday = 4;
        et1.tm_month = 4 - 1;
        et1.tm_year = 1917;
        et1.tm_params = PR_GMTParameters(&et1);
        PR_NormalizeTime(&et1, PR_LocalTimeParameters);
        secs = PR_ImplodeTime(&et1);
        if (LL_GE_ZERO(secs)) {
            if (debug_mode) {
                printf("ERROR: April 4, 1917 GMT returns a nonnegative second count\n");
            }
            failed_already = 1;
            return 1;
        }
        PR_ExplodeTime(secs, PR_LocalTimeParameters, &et2);
        if (!ExplodedTimeIsEqual(&et1, &et2)) {
            if (debug_mode) {
                printf("ERROR: PR_ImplodeTime and PR_ExplodeTime are not inverse for April 4, 1917 GMT\n");
            }
            failed_already=1;
            return 1;
        }
        ttt = PR_ImplodeTime(&et1);
        testParseTimeString( ttt );

        if (debug_mode) {
            printf("Test passed for April 4, 1917\n");
        }

        /* July 4, 2050 */
        et1.tm_usec = 0;
        et1.tm_sec = 0;
        et1.tm_min = 0;
        et1.tm_hour = 0;
        et1.tm_mday = 4;
        et1.tm_month = 7 - 1;
        et1.tm_year = 2050;
        et1.tm_params = PR_GMTParameters(&et1);
        PR_NormalizeTime(&et1, PR_LocalTimeParameters);
        secs = PR_ImplodeTime(&et1);
        if (!LL_GE_ZERO(secs)) {
            if (debug_mode) {
                printf("ERROR: July 4, 2050 GMT returns a negative second count\n");
            }
            failed_already = 1;
            return 1;
        }
        PR_ExplodeTime(secs, PR_LocalTimeParameters, &et2);
        if (!ExplodedTimeIsEqual(&et1, &et2)) {
            if (debug_mode) {
                printf("ERROR: PR_ImplodeTime and PR_ExplodeTime are not inverse for July 4, 2050 GMT\n");
            }
            failed_already=1;
            return 1;
        }
        testParseTimeString(PR_ImplodeTime(&et1));

        if (debug_mode) {
            printf("Test passed for July 4, 2050\n");
        }

    }

    /*
     **************************************************************
     **
     **  Stress test
     *
     **      Go through four years, starting from
     **      00:00:00 PST Jan. 1, 2005, incrementing
     **      every 10 minutes.
     **
     **************************************************************
     */

    {
        PRExplodedTime et, et1, et2;
        PRInt64 usecPer10Min;
        int day, hour, min;
        PRTime usecs;
        int dstInEffect = 0;

        if (debug_mode) {
            printf("\n");
            printf("*******************************************************\n");
            printf("**                                                   **\n");
            printf("**        Stress test  Pacific Time                  **\n");
            printf("**  Starting from midnight Jan. 1, 2005 PST,         **\n");
            printf("**  going through four years in 10-minute increment  **\n");
            printf("**                                                   **\n");
            printf("*******************************************************\n\n");
        }
        LL_I2L(usecPer10Min, 600000000L);

        /* 00:00:00 PST Jan. 1, 2005 */
        et.tm_usec = 0;
        et.tm_sec = 0;
        et.tm_min = 0;
        et.tm_hour = 0;
        et.tm_mday = 1;
        et.tm_month = 0;
        et.tm_year = 2005;
        et.tm_params.tp_gmt_offset = -8 * 3600;
        et.tm_params.tp_dst_offset = 0;
        usecs = PR_ImplodeTime(&et);

        for (day = 0; day < 4 * 365 + 1; day++) {
            for (hour = 0; hour < 24; hour++) {
                for (min = 0; min < 60; min += 10) {
                    LL_ADD(usecs, usecs, usecPer10Min);
                    PR_ExplodeTime(usecs, PR_USPacificTimeParameters, &et1);

                    et2 = et;
                    et2.tm_usec += 600000000L;
                    PR_NormalizeTime(&et2, PR_USPacificTimeParameters);

                    if (!ExplodedTimeIsEqual(&et1, &et2)) {
                        printf("ERROR: componentwise comparison failed\n");
                        PrintExplodedTime(&et1);
                        printf("\n");
                        PrintExplodedTime(&et2);
                        printf("\n");
                        failed_already=1;
                        return 1;
                    }

                    if (LL_NE(usecs, PR_ImplodeTime(&et1))) {
                        printf("ERROR: PR_ExplodeTime and PR_ImplodeTime are not inverse\n");
                        PrintExplodedTime(&et1);
                        printf("\n");
                        failed_already=1;
                        return 1;
                    }
                    testParseTimeString(usecs);

                    if (!dstInEffect && et1.tm_params.tp_dst_offset) {
                        dstInEffect = 1;
                        if (debug_mode) {
                            printf("DST changeover from ");
                            PrintExplodedTime(&et);
                            printf(" to ");
                            PrintExplodedTime(&et1);
                            printf(".\n");
                        }
                    } else if (dstInEffect && !et1.tm_params.tp_dst_offset) {
                        dstInEffect = 0;
                        if (debug_mode) {
                            printf("DST changeover from ");
                            PrintExplodedTime(&et);
                            printf(" to ");
                            PrintExplodedTime(&et1);
                            printf(".\n");
                        }
                    }

                    et = et1;
                }
            }
        }
        if (debug_mode) {
            printf("Test passed\n");
        }
    }


    /* Same stress test, but with PR_LocalTimeParameters */

    {
        PRExplodedTime et, et1, et2;
        PRInt64 usecPer10Min;
        int day, hour, min;
        PRTime usecs;
        int dstInEffect = 0;

        if (debug_mode) {
            printf("\n");
            printf("*******************************************************\n");
            printf("**                                                   **\n");
            printf("**         Stress test    Local Time                 **\n");
            printf("**  Starting from midnight Jan. 1, 2005 PST,         **\n");
            printf("**  going through four years in 10-minute increment  **\n");
            printf("**                                                   **\n");
            printf("*******************************************************\n\n");
        }

        LL_I2L(usecPer10Min, 600000000L);

        /* 00:00:00 PST Jan. 1, 2005 */
        et.tm_usec = 0;
        et.tm_sec = 0;
        et.tm_min = 0;
        et.tm_hour = 0;
        et.tm_mday = 1;
        et.tm_month = 0;
        et.tm_year = 2005;
        et.tm_params.tp_gmt_offset = -8 * 3600;
        et.tm_params.tp_dst_offset = 0;
        usecs = PR_ImplodeTime(&et);

        for (day = 0; day < 4 * 365 + 1; day++) {
            for (hour = 0; hour < 24; hour++) {
                for (min = 0; min < 60; min += 10) {
                    LL_ADD(usecs, usecs, usecPer10Min);
                    PR_ExplodeTime(usecs, PR_LocalTimeParameters, &et1);

                    et2 = et;
                    et2.tm_usec += 600000000L;
                    PR_NormalizeTime(&et2, PR_LocalTimeParameters);

                    if (!ExplodedTimeIsEqual(&et1, &et2)) {
                        printf("ERROR: componentwise comparison failed\n");
                        PrintExplodedTime(&et1);
                        printf("\n");
                        PrintExplodedTime(&et2);
                        printf("\n");
                        return 1;
                    }

                    if (LL_NE(usecs, PR_ImplodeTime(&et1))) {
                        printf("ERROR: PR_ExplodeTime and PR_ImplodeTime are not inverse\n");
                        PrintExplodedTime(&et1);
                        printf("\n");
                        failed_already=1;
                        return 1;
                    }
                    testParseTimeString(usecs);

                    if (!dstInEffect && et1.tm_params.tp_dst_offset) {
                        dstInEffect = 1;
                        if (debug_mode) {
                            printf("DST changeover from ");
                            PrintExplodedTime(&et);
                            printf(" to ");
                            PrintExplodedTime(&et1);
                            printf(".\n");
                        }
                    } else if (dstInEffect && !et1.tm_params.tp_dst_offset) {
                        dstInEffect = 0;
                        if (debug_mode) {
                            printf("DST changeover from ");
                            PrintExplodedTime(&et);
                            printf(" to ");
                            PrintExplodedTime(&et1);
                            printf(".\n");
                        }
                    }

                    et = et1;
                }
            }
        }
        if (debug_mode) {
            printf("Test passed\n");
        }
    }

    /* Same stress test, but with PR_LocalTimeParameters and going backward */

    {
        PRExplodedTime et, et1, et2;
        PRInt64 usecPer10Min;
        int day, hour, min;
        PRTime usecs;
        int dstInEffect = 0;

        if (debug_mode) {
            printf("\n");
            printf("*******************************************************\n");
            printf("**                                                   **\n");
            printf("**           Stress test    Local Time               **\n");
            printf("**  Starting from midnight Jan. 1, 2009 PST,         **\n");
            printf("**  going back four years in 10-minute increment     **\n");
            printf("**                                                   **\n");
            printf("*******************************************************\n\n");
        }

        LL_I2L(usecPer10Min, 600000000L);

        /* 00:00:00 PST Jan. 1, 2009 */
        et.tm_usec = 0;
        et.tm_sec = 0;
        et.tm_min = 0;
        et.tm_hour = 0;
        et.tm_mday = 1;
        et.tm_month = 0;
        et.tm_year = 2009;
        et.tm_params.tp_gmt_offset = -8 * 3600;
        et.tm_params.tp_dst_offset = 0;
        usecs = PR_ImplodeTime(&et);

        for (day = 0; day < 4 * 365 + 1; day++) {
            for (hour = 0; hour < 24; hour++) {
                for (min = 0; min < 60; min += 10) {
                    LL_SUB(usecs, usecs, usecPer10Min);
                    PR_ExplodeTime(usecs, PR_LocalTimeParameters, &et1);

                    et2 = et;
                    et2.tm_usec -= 600000000L;
                    PR_NormalizeTime(&et2, PR_LocalTimeParameters);

                    if (!ExplodedTimeIsEqual(&et1, &et2)) {
                        printf("ERROR: componentwise comparison failed\n");
                        PrintExplodedTime(&et1);
                        printf("\n");
                        PrintExplodedTime(&et2);
                        printf("\n");
                        return 1;
                    }

                    if (LL_NE(usecs, PR_ImplodeTime(&et1))) {
                        printf("ERROR: PR_ExplodeTime and PR_ImplodeTime are not inverse\n");
                        PrintExplodedTime(&et1);
                        printf("\n");
                        failed_already=1;
                        return 1;
                    }
                    testParseTimeString(usecs);

                    if (!dstInEffect && et1.tm_params.tp_dst_offset) {
                        dstInEffect = 1;
                        if (debug_mode) {
                            printf("DST changeover from ");
                            PrintExplodedTime(&et);
                            printf(" to ");
                            PrintExplodedTime(&et1);
                            printf(".\n");
                        }
                    } else if (dstInEffect && !et1.tm_params.tp_dst_offset) {
                        dstInEffect = 0;
                        if (debug_mode) {
                            printf("DST changeover from ");
                            PrintExplodedTime(&et);
                            printf(" to ");
                            PrintExplodedTime(&et1);
                            printf(".\n");
                        }
                    }

                    et = et1;
                }
            }
        }
    }

    if (failed_already) {
        return 1;
    }
    else {
        return 0;
    }

}