/* strftime - formatted time and date to a string */ /* * Modified slightly by Chet Ramey for inclusion in Bash */ /* * strftime.c * * Public-domain implementation of ISO C library routine. * * If you can't do prototypes, get GCC. * * The C99 standard now specifies just about all of the formats * that were additional in the earlier versions of this file. * * For extensions from SunOS, add SUNOS_EXT. * For extensions from HP/UX, add HPUX_EXT. * For VMS dates, add VMS_EXT. * For complete POSIX semantics, add POSIX_SEMANTICS. * * The code for %c, %x, and %X follows the C99 specification for * the "C" locale. * * This version ignores LOCALE information. * It also doesn't worry about multi-byte characters. * So there. * * Arnold Robbins * January, February, March, 1991 * Updated March, April 1992 * Updated April, 1993 * Updated February, 1994 * Updated May, 1994 * Updated January, 1995 * Updated September, 1995 * Updated January, 1996 * Updated July, 1997 * Updated October, 1999 * Updated September, 2000 * Updated December, 2001 * Updated January, 2011 * Updated April, 2012 * * Fixes from ado@elsie.nci.nih.gov, * February 1991, May 1992 * Fixes from Tor Lillqvist tml@tik.vtt.fi, * May 1993 * Further fixes from ado@elsie.nci.nih.gov, * February 1994 * %z code from chip@chinacat.unicom.com, * Applied September 1995 * %V code fixed (again) and %G, %g added, * January 1996 * %v code fixed, better configuration, * July 1997 * Moved to C99 specification. * September 2000 * Fixes from Tanaka Akira * December 2001 */ #include #include #include #include #include #if defined(TM_IN_SYS_TIME) #include #include #endif #include #include /* defaults: season to taste */ #define SUNOS_EXT 1 /* stuff in SunOS strftime routine */ #define VMS_EXT 1 /* include %v for VMS date format */ #define HPUX_EXT 1 /* non-conflicting stuff in HP-UX date */ #define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */ #define POSIX_2008 1 /* flag and fw for C, F, G, Y formats */ #undef strchr /* avoid AIX weirdness */ #if !defined (errno) extern int errno; #endif #if defined (SHELL) extern char *get_string_value (const char *); #endif extern void tzset(void); static int weeknumber(const struct tm *timeptr, int firstweekday); static int iso8601wknum(const struct tm *timeptr); #ifndef inline #ifdef __GNUC__ #define inline __inline__ #else #define inline /**/ #endif #endif #define range(low, item, hi) max(low, min(item, hi)) /* Whew! This stuff is a mess. */ #if !defined(OS2) && !defined(MSDOS) && !defined(__CYGWIN__) && defined(HAVE_TZNAME) extern char *tzname[2]; extern int daylight; #if defined(SOLARIS) || defined(mips) || defined (M_UNIX) extern long int timezone, altzone; #else # if defined (HPUX) || defined(__hpux) extern long int timezone; # else # if !defined(__CYGWIN__) extern int timezone, altzone; # endif # endif #endif #endif #undef min /* just in case */ /* min --- return minimum of two numbers */ static inline int min(int a, int b) { return (a < b ? a : b); } #undef max /* also, just in case */ /* max --- return maximum of two numbers */ static inline int max(int a, int b) { return (a > b ? a : b); } #ifdef POSIX_2008 /* iso_8601_2000_year --- format a year per ISO 8601:2000 as in 1003.1 */ static void iso_8601_2000_year(char *buf, int year, size_t fw) { int extra; char sign = '\0'; if (year >= -9999 && year <= 9999) { sprintf(buf, "%0*d", (int) fw, year); return; } /* now things get weird */ if (year > 9999) { sign = '+'; } else { sign = '-'; year = -year; } extra = year / 10000; year %= 10000; sprintf(buf, "%c_%04d_%d", sign, extra, year); } #endif /* POSIX_2008 */ /* strftime --- produce formatted time */ size_t strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr) { char *endp = s + maxsize; char *start = s; auto char tbuf[100]; long off; int i, w, oerrno; long y; static short first = 1; #ifdef POSIX_SEMANTICS static char *savetz = NULL; static int savetzlen = 0; char *tz; #endif /* POSIX_SEMANTICS */ #ifndef HAVE_TM_ZONE #ifndef HAVE_TM_NAME #ifndef HAVE_TZNAME #ifndef __CYGWIN__ extern char *timezone(); struct timeval tv; struct timezone zone; #endif /* __CYGWIN__ */ #endif /* HAVE_TZNAME */ #endif /* HAVE_TM_NAME */ #endif /* HAVE_TM_ZONE */ #ifdef POSIX_2008 int pad; size_t fw; char flag; #endif /* POSIX_2008 */ /* various tables, useful in North America */ static const char *days_a[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", }; static const char *days_l[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", }; static const char *months_a[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", }; static const char *months_l[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December", }; static const char *ampm[] = { "AM", "PM", }; oerrno = errno; if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0) return 0; /* quick check if we even need to bother */ if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) return 0; #ifndef POSIX_SEMANTICS if (first) { tzset(); first = 0; } #else /* POSIX_SEMANTICS */ #if defined (SHELL) tz = get_string_value ("TZ"); #else tz = getenv("TZ"); #endif if (first) { if (tz != NULL) { int tzlen = strlen(tz); savetz = (char *) malloc(tzlen + 1); if (savetz != NULL) { savetzlen = tzlen + 1; strcpy(savetz, tz); } } tzset(); first = 0; } /* if we have a saved TZ, and it is different, recapture and reset */ if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) { i = strlen(tz) + 1; if (i > savetzlen) { savetz = (char *) realloc(savetz, i); if (savetz) { savetzlen = i; strcpy(savetz, tz); } } else strcpy(savetz, tz); tzset(); } #endif /* POSIX_SEMANTICS */ for (; *format && s < endp - 1; format++) { tbuf[0] = '\0'; if (*format != '%') { *s++ = *format; continue; } #ifdef POSIX_2008 pad = '\0'; fw = 0; flag = '\0'; switch (*++format) { case '+': flag = '+'; /* fall through */ case '0': pad = '0'; format++; break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': break; default: format--; goto again; } for (; isdigit(*format); format++) { fw = fw * 10 + (*format - '0'); } format--; #endif /* POSIX_2008 */ again: switch (*++format) { case '\0': *s++ = '%'; goto out; case '%': *s++ = '%'; continue; case 'a': /* abbreviated weekday name */ if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) strcpy(tbuf, "?"); else strcpy(tbuf, days_a[timeptr->tm_wday]); break; case 'A': /* full weekday name */ if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) strcpy(tbuf, "?"); else strcpy(tbuf, days_l[timeptr->tm_wday]); break; case 'b': /* abbreviated month name */ short_month: if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) strcpy(tbuf, "?"); else strcpy(tbuf, months_a[timeptr->tm_mon]); break; case 'B': /* full month name */ if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) strcpy(tbuf, "?"); else strcpy(tbuf, months_l[timeptr->tm_mon]); break; case 'c': /* appropriate date and time representation */ /* * This used to be: * * strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr); * * Now, per the ISO 1999 C standard, it this: */ strftime(tbuf, sizeof tbuf, "%A %B %d %T %Y", timeptr); break; case 'C': #ifdef POSIX_2008 if (pad != '\0' && fw > 0) { size_t min_fw = (flag ? 3 : 2); fw = max(fw, min_fw); sprintf(tbuf, flag ? "%+0*ld" : "%0*ld", (int) fw, (timeptr->tm_year + 1900L) / 100); } else #endif /* POSIX_2008 */ century: sprintf(tbuf, "%02ld", (timeptr->tm_year + 1900L) / 100); break; case 'd': /* day of the month, 01 - 31 */ i = range(1, timeptr->tm_mday, 31); sprintf(tbuf, "%02d", i); break; case 'D': /* date as %m/%d/%y */ strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr); break; case 'e': /* day of month, blank padded */ sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31)); break; case 'E': /* POSIX (now C99) locale extensions, ignored for now */ goto again; case 'F': /* ISO 8601 date representation */ { #ifdef POSIX_2008 /* * Field width for %F is for the whole thing. * It must be at least 10. */ char m_d[10]; strftime(m_d, sizeof m_d, "-%m-%d", timeptr); size_t min_fw = 10; if (pad != '\0' && fw > 0) { fw = max(fw, min_fw); } else { fw = min_fw; } fw -= 6; /* -XX-XX at end are invariant */ iso_8601_2000_year(tbuf, timeptr->tm_year + 1900, fw); strcat(tbuf, m_d); #else strftime(tbuf, sizeof tbuf, "%Y-%m-%d", timeptr); #endif /* POSIX_2008 */ } break; case 'g': case 'G': /* * Year of ISO week. * * If it's December but the ISO week number is one, * that week is in next year. * If it's January but the ISO week number is 52 or * 53, that week is in last year. * Otherwise, it's this year. */ w = iso8601wknum(timeptr); if (timeptr->tm_mon == 11 && w == 1) y = 1900L + timeptr->tm_year + 1; else if (timeptr->tm_mon == 0 && w >= 52) y = 1900L + timeptr->tm_year - 1; else y = 1900L + timeptr->tm_year; if (*format == 'G') { #ifdef POSIX_2008 if (pad != '\0' && fw > 0) { size_t min_fw = 4; fw = max(fw, min_fw); sprintf(tbuf, flag ? "%+0*ld" : "%0*ld", (int) fw, y); } else #endif /* POSIX_2008 */ sprintf(tbuf, "%ld", y); } else sprintf(tbuf, "%02ld", y % 100); break; case 'h': /* abbreviated month name */ goto short_month; case 'H': /* hour, 24-hour clock, 00 - 23 */ i = range(0, timeptr->tm_hour, 23); sprintf(tbuf, "%02d", i); break; case 'I': /* hour, 12-hour clock, 01 - 12 */ i = range(0, timeptr->tm_hour, 23); if (i == 0) i = 12; else if (i > 12) i -= 12; sprintf(tbuf, "%02d", i); break; case 'j': /* day of the year, 001 - 366 */ sprintf(tbuf, "%03d", timeptr->tm_yday + 1); break; case 'm': /* month, 01 - 12 */ i = range(0, timeptr->tm_mon, 11); sprintf(tbuf, "%02d", i + 1); break; case 'M': /* minute, 00 - 59 */ i = range(0, timeptr->tm_min, 59); sprintf(tbuf, "%02d", i); break; case 'n': /* same as \n */ tbuf[0] = '\n'; tbuf[1] = '\0'; break; case 'O': /* POSIX (now C99) locale extensions, ignored for now */ goto again; case 'p': /* am or pm based on 12-hour clock */ i = range(0, timeptr->tm_hour, 23); if (i < 12) strcpy(tbuf, ampm[0]); else strcpy(tbuf, ampm[1]); break; case 'r': /* time as %I:%M:%S %p */ strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr); break; case 'R': /* time as %H:%M */ strftime(tbuf, sizeof tbuf, "%H:%M", timeptr); break; #if defined(HAVE_MKTIME) case 's': /* time as seconds since the Epoch */ { struct tm non_const_timeptr; non_const_timeptr = *timeptr; sprintf(tbuf, "%ld", mktime(& non_const_timeptr)); break; } #endif /* defined(HAVE_MKTIME) */ case 'S': /* second, 00 - 60 */ i = range(0, timeptr->tm_sec, 60); sprintf(tbuf, "%02d", i); break; case 't': /* same as \t */ tbuf[0] = '\t'; tbuf[1] = '\0'; break; case 'T': /* time as %H:%M:%S */ the_time: strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr); break; case 'u': /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */ sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 : timeptr->tm_wday); break; case 'U': /* week of year, Sunday is first day of week */ sprintf(tbuf, "%02d", weeknumber(timeptr, 0)); break; case 'V': /* week of year according ISO 8601 */ sprintf(tbuf, "%02d", iso8601wknum(timeptr)); break; case 'w': /* weekday, Sunday == 0, 0 - 6 */ i = range(0, timeptr->tm_wday, 6); sprintf(tbuf, "%d", i); break; case 'W': /* week of year, Monday is first day of week */ sprintf(tbuf, "%02d", weeknumber(timeptr, 1)); break; case 'x': /* appropriate date representation */ strftime(tbuf, sizeof tbuf, "%A %B %d %Y", timeptr); break; case 'X': /* appropriate time representation */ goto the_time; break; case 'y': /* year without a century, 00 - 99 */ year: i = timeptr->tm_year % 100; sprintf(tbuf, "%02d", i); break; case 'Y': /* year with century */ #ifdef POSIX_2008 if (pad != '\0' && fw > 0) { size_t min_fw = 4; fw = max(fw, min_fw); sprintf(tbuf, flag ? "%+0*ld" : "%0*ld", (int) fw, 1900L + timeptr->tm_year); } else #endif /* POSIX_2008 */ sprintf(tbuf, "%ld", 1900L + timeptr->tm_year); break; /* * From: Chip Rosenthal * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST) * * Warning: the %z [code] is implemented by inspecting the * timezone name conditional compile settings, and * inferring a method to get timezone offsets. I've tried * this code on a couple of machines, but I don't doubt * there is some system out there that won't like it. * Maybe the easiest thing to do would be to bracket this * with an #ifdef that can turn it off. The %z feature * would be an admittedly obscure one that most folks can * live without, but it would be a great help to those of * us that muck around with various message processors. */ case 'z': /* time zone offset east of GMT e.g. -0600 */ if (timeptr->tm_isdst < 0) break; #ifdef HAVE_TM_NAME /* * Systems with tm_name probably have tm_tzadj as * secs west of GMT. Convert to mins east of GMT. */ off = -timeptr->tm_tzadj / 60; #else /* !HAVE_TM_NAME */ #ifdef HAVE_TM_ZONE /* * Systems with tm_zone probably have tm_gmtoff as * secs east of GMT. Convert to mins east of GMT. */ off = timeptr->tm_gmtoff / 60; #else /* !HAVE_TM_ZONE */ #if HAVE_TZNAME /* * Systems with tzname[] probably have timezone as * secs west of GMT. Convert to mins east of GMT. */ # if defined(__hpux) || defined (HPUX) || defined(__CYGWIN__) off = -timezone / 60; # else /* ADR: 4 August 2001, fixed this per gazelle@interaccess.com */ off = -(daylight ? altzone : timezone) / 60; # endif #else /* !HAVE_TZNAME */ gettimeofday(& tv, & zone); off = -zone.tz_minuteswest; #endif /* !HAVE_TZNAME */ #endif /* !HAVE_TM_ZONE */ #endif /* !HAVE_TM_NAME */ if (off < 0) { tbuf[0] = '-'; off = -off; } else { tbuf[0] = '+'; } sprintf(tbuf+1, "%02ld%02ld", off/60, off%60); break; case 'Z': /* time zone name or abbreviation */ #ifdef HAVE_TZNAME i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */ strcpy(tbuf, tzname[i]); #else #ifdef HAVE_TM_ZONE strcpy(tbuf, timeptr->tm_zone); #else #ifdef HAVE_TM_NAME strcpy(tbuf, timeptr->tm_name); #else gettimeofday(& tv, & zone); strcpy(tbuf, timezone(zone.tz_minuteswest, timeptr->tm_isdst > 0)); #endif /* HAVE_TM_NAME */ #endif /* HAVE_TM_ZONE */ #endif /* HAVE_TZNAME */ break; #ifdef SUNOS_EXT case 'k': /* hour, 24-hour clock, blank pad */ sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23)); break; case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */ i = range(0, timeptr->tm_hour, 23); if (i == 0) i = 12; else if (i > 12) i -= 12; sprintf(tbuf, "%2d", i); break; #endif #ifdef HPUX_EXT case 'N': /* Emperor/Era name */ /* this is essentially the same as the century */ goto century; /* %C */ case 'o': /* Emperor/Era year */ goto year; /* %y */ #endif /* HPUX_EXT */ #ifdef VMS_EXT case 'v': /* date as dd-bbb-YYYY */ sprintf(tbuf, "%2d-%3.3s-%4ld", range(1, timeptr->tm_mday, 31), months_a[range(0, timeptr->tm_mon, 11)], timeptr->tm_year + 1900L); for (i = 3; i < 6; i++) if (islower(tbuf[i])) tbuf[i] = toupper(tbuf[i]); break; #endif default: tbuf[0] = '%'; tbuf[1] = *format; tbuf[2] = '\0'; break; } i = strlen(tbuf); if (i) { if (s + i < endp - 1) { strcpy(s, tbuf); s += i; } else return 0; } } out: if (s < endp && *format == '\0') { *s = '\0'; if (s == start) errno = oerrno; return (s - start); } else return 0; } /* isleap --- is a year a leap year? */ static int isleap(long year) { return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0); } /* iso8601wknum --- compute week number according to ISO 8601 */ static int iso8601wknum(const struct tm *timeptr) { /* * From 1003.2: * If the week (Monday to Sunday) containing January 1 * has four or more days in the new year, then it is week 1; * otherwise it is the highest numbered week of the previous * year (52 or 53), and the next week is week 1. * * ADR: This means if Jan 1 was Monday through Thursday, * it was week 1, otherwise week 52 or 53. * * XPG4 erroneously included POSIX.2 rationale text in the * main body of the standard. Thus it requires week 53. */ int weeknum, jan1day, diff; /* get week number, Monday as first day of the week */ weeknum = weeknumber(timeptr, 1); /* * With thanks and tip of the hatlo to tml@tik.vtt.fi * * What day of the week does January 1 fall on? * We know that * (timeptr->tm_yday - jan1.tm_yday) MOD 7 == * (timeptr->tm_wday - jan1.tm_wday) MOD 7 * and that * jan1.tm_yday == 0 * and that * timeptr->tm_wday MOD 7 == timeptr->tm_wday * from which it follows that. . . */ jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7); if (jan1day < 0) jan1day += 7; /* * If Jan 1 was a Monday through Thursday, it was in * week 1. Otherwise it was last year's highest week, which is * this year's week 0. * * What does that mean? * If Jan 1 was Monday, the week number is exactly right, it can * never be 0. * If it was Tuesday through Thursday, the weeknumber is one * less than it should be, so we add one. * Otherwise, Friday, Saturday or Sunday, the week number is * OK, but if it is 0, it needs to be 52 or 53. */ switch (jan1day) { case 1: /* Monday */ break; case 2: /* Tuesday */ case 3: /* Wednesday */ case 4: /* Thursday */ weeknum++; break; case 5: /* Friday */ case 6: /* Saturday */ case 0: /* Sunday */ if (weeknum == 0) { #ifdef USE_BROKEN_XPG4 /* XPG4 (as of March 1994) says 53 unconditionally */ weeknum = 53; #else /* get week number of last week of last year */ struct tm dec31ly; /* 12/31 last year */ dec31ly = *timeptr; dec31ly.tm_year--; dec31ly.tm_mon = 11; dec31ly.tm_mday = 31; dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1; dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L); weeknum = iso8601wknum(& dec31ly); #endif } break; } if (timeptr->tm_mon == 11) { /* * The last week of the year * can be in week 1 of next year. * Sigh. * * This can only happen if * M T W * 29 30 31 * 30 31 * 31 */ int wday, mday; wday = timeptr->tm_wday; mday = timeptr->tm_mday; if ( (wday == 1 && (mday >= 29 && mday <= 31)) || (wday == 2 && (mday == 30 || mday == 31)) || (wday == 3 && mday == 31)) weeknum = 1; } return weeknum; } /* weeknumber --- figure how many weeks into the year */ /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */ static int weeknumber(const struct tm *timeptr, int firstweekday) { int wday = timeptr->tm_wday; int ret; if (firstweekday == 1) { if (wday == 0) /* sunday */ wday = 6; else wday--; } ret = ((timeptr->tm_yday + 7 - wday) / 7); if (ret < 0) ret = 0; return ret; } #if 0 /* ADR --- I'm loathe to mess with ado's code ... */ Date: Wed, 24 Apr 91 20:54:08 MDT From: Michal Jaegermann To: arnold@audiofax.com Hi Arnold, in a process of fixing of strftime() in libraries on Atari ST I grabbed some pieces of code from your own strftime. When doing that it came to mind that your weeknumber() function compiles a little bit nicer in the following form: /* * firstweekday is 0 if starting in Sunday, non-zero if in Monday */ { return (timeptr->tm_yday - timeptr->tm_wday + (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7; } How nicer it depends on a compiler, of course, but always a tiny bit. Cheers, Michal ntomczak@vm.ucs.ualberta.ca #endif #ifdef TEST_STRFTIME /* * NAME: * tst * * SYNOPSIS: * tst * * DESCRIPTION: * "tst" is a test driver for the function "strftime". * * OPTIONS: * None. * * AUTHOR: * Karl Vogel * Control Data Systems, Inc. * vogelke@c-17igp.wpafb.af.mil * * BUGS: * None noticed yet. * * COMPILE: * cc -o tst -DTEST_STRFTIME strftime.c */ /* ADR: I reformatted this to my liking, and deleted some unneeded code. */ #ifndef NULL #include #endif #include #include #define MAXTIME 132 /* * Array of time formats. */ static char *array[] = { "(%%A) full weekday name, var length (Sunday..Saturday) %A", "(%%B) full month name, var length (January..December) %B", "(%%C) Century %C", "(%%D) date (%%m/%%d/%%y) %D", "(%%E) Locale extensions (ignored) %E", "(%%F) full month name, var length (January..December) %F", "(%%H) hour (24-hour clock, 00..23) %H", "(%%I) hour (12-hour clock, 01..12) %I", "(%%M) minute (00..59) %M", "(%%N) Emperor/Era Name %N", "(%%O) Locale extensions (ignored) %O", "(%%R) time, 24-hour (%%H:%%M) %R", "(%%S) second (00..60) %S", "(%%T) time, 24-hour (%%H:%%M:%%S) %T", "(%%U) week of year, Sunday as first day of week (00..53) %U", "(%%V) week of year according to ISO 8601 %V", "(%%W) week of year, Monday as first day of week (00..53) %W", "(%%X) appropriate locale time representation (%H:%M:%S) %X", "(%%Y) year with century (1970...) %Y", "(%%Z) timezone (EDT), or blank if timezone not determinable %Z", "(%%a) locale's abbreviated weekday name (Sun..Sat) %a", "(%%b) locale's abbreviated month name (Jan..Dec) %b", "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c", "(%%d) day of the month (01..31) %d", "(%%e) day of the month, blank-padded ( 1..31) %e", "(%%h) should be same as (%%b) %h", "(%%j) day of the year (001..366) %j", "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k", "(%%l) hour, 12-hour clock, blank pad ( 0..12) %l", "(%%m) month (01..12) %m", "(%%o) Emperor/Era Year %o", "(%%p) locale's AM or PM based on 12-hour clock %p", "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r", "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u", "(%%v) VMS date (dd-bbb-YYYY) %v", "(%%w) day of week (0..6, Sunday == 0) %w", "(%%x) appropriate locale date representation %x", "(%%y) last two digits of year (00..99) %y", "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z", (char *) NULL }; /* main routine. */ int main(argc, argv) int argc; char **argv; { long time(); char *next; char string[MAXTIME]; int k; int length; struct tm *tm; long clock; /* Call the function. */ clock = time((long *) 0); tm = localtime(&clock); for (k = 0; next = array[k]; k++) { length = strftime(string, MAXTIME, next, tm); printf("%s\n", string); } exit(0); } #endif /* TEST_STRFTIME */