2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
10 * This is like mktime, but without normalization of tm_wday and tm_yday.
12 static time_t tm_to_time_t(const struct tm *tm)
14 static const int mdays[] = {
15 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
17 int year = tm->tm_year - 70;
18 int month = tm->tm_mon;
19 int day = tm->tm_mday;
21 if (year < 0 || year > 129) /* algo only works for 1970-2099 */
23 if (month < 0 || month > 11) /* array bounds */
25 if (month < 2 || (year + 2) % 4)
27 if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
29 return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
30 tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
33 static const char *month_names[] = {
34 "January", "February", "March", "April", "May", "June",
35 "July", "August", "September", "October", "November", "December"
38 static const char *weekday_names[] = {
39 "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
42 static time_t gm_time_t(unsigned long time, int tz)
46 minutes = tz < 0 ? -tz : tz;
47 minutes = (minutes / 100)*60 + (minutes % 100);
48 minutes = tz < 0 ? -minutes : minutes;
49 return time + minutes * 60;
53 * The "tz" thing is passed in as this strange "decimal parse of tz"
54 * thing, which means that tz -0100 is passed in as the integer -100,
55 * even though it means "sixty minutes off"
57 static struct tm *time_to_tm(unsigned long time, int tz)
59 time_t t = gm_time_t(time, tz);
64 * What value of "tz" was in effect back then at "time" in the
67 static int local_tzoffset(unsigned long time)
75 t_local = tm_to_time_t(&tm);
84 offset /= 60; /* in minutes */
85 offset = (offset % 60) + ((offset / 60) * 100);
86 return offset * eastwest;
89 void show_date_relative(unsigned long time, int tz,
90 const struct timeval *now,
91 struct strbuf *timebuf)
94 if (now->tv_sec < time) {
95 strbuf_addstr(timebuf, _("in the future"));
98 diff = now->tv_sec - time;
101 Q_("%lu second ago", "%lu seconds ago", diff), diff);
104 /* Turn it into minutes */
105 diff = (diff + 30) / 60;
108 Q_("%lu minute ago", "%lu minutes ago", diff), diff);
111 /* Turn it into hours */
112 diff = (diff + 30) / 60;
115 Q_("%lu hour ago", "%lu hours ago", diff), diff);
118 /* We deal with number of days from here on */
119 diff = (diff + 12) / 24;
122 Q_("%lu day ago", "%lu days ago", diff), diff);
125 /* Say weeks for the past 10 weeks or so */
128 Q_("%lu week ago", "%lu weeks ago", (diff + 3) / 7),
132 /* Say months for the past 12 months or so */
135 Q_("%lu month ago", "%lu months ago", (diff + 15) / 30),
139 /* Give years and months for 5 years or so */
141 unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2);
142 unsigned long years = totalmonths / 12;
143 unsigned long months = totalmonths % 12;
145 struct strbuf sb = STRBUF_INIT;
146 strbuf_addf(&sb, Q_("%lu year", "%lu years", years), years);
148 /* TRANSLATORS: "%s" is "<n> years" */
149 Q_("%s, %lu month ago", "%s, %lu months ago", months),
154 Q_("%lu year ago", "%lu years ago", years), years);
157 /* Otherwise, just years. Centuries is probably overkill. */
159 Q_("%lu year ago", "%lu years ago", (diff + 183) / 365),
163 struct date_mode *date_mode_from_type(enum date_mode_type type)
165 static struct date_mode mode;
170 const char *show_date(unsigned long time, int tz, const struct date_mode *mode)
173 static struct strbuf timebuf = STRBUF_INIT;
175 if (mode->type == DATE_RAW) {
176 strbuf_reset(&timebuf);
177 strbuf_addf(&timebuf, "%lu %+05d", time, tz);
181 if (mode->type == DATE_RELATIVE) {
184 strbuf_reset(&timebuf);
185 gettimeofday(&now, NULL);
186 show_date_relative(time, tz, &now, &timebuf);
190 if (mode->type == DATE_LOCAL)
191 tz = local_tzoffset(time);
193 tm = time_to_tm(time, tz);
195 tm = time_to_tm(0, 0);
199 strbuf_reset(&timebuf);
200 if (mode->type == DATE_SHORT)
201 strbuf_addf(&timebuf, "%04d-%02d-%02d", tm->tm_year + 1900,
202 tm->tm_mon + 1, tm->tm_mday);
203 else if (mode->type == DATE_ISO8601)
204 strbuf_addf(&timebuf, "%04d-%02d-%02d %02d:%02d:%02d %+05d",
208 tm->tm_hour, tm->tm_min, tm->tm_sec,
210 else if (mode->type == DATE_ISO8601_STRICT) {
211 char sign = (tz >= 0) ? '+' : '-';
213 strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
217 tm->tm_hour, tm->tm_min, tm->tm_sec,
218 sign, tz / 100, tz % 100);
219 } else if (mode->type == DATE_RFC2822)
220 strbuf_addf(&timebuf, "%.3s, %d %.3s %d %02d:%02d:%02d %+05d",
221 weekday_names[tm->tm_wday], tm->tm_mday,
222 month_names[tm->tm_mon], tm->tm_year + 1900,
223 tm->tm_hour, tm->tm_min, tm->tm_sec, tz);
225 strbuf_addf(&timebuf, "%.3s %.3s %d %02d:%02d:%02d %d%c%+05d",
226 weekday_names[tm->tm_wday],
227 month_names[tm->tm_mon],
229 tm->tm_hour, tm->tm_min, tm->tm_sec,
231 (mode->type == DATE_LOCAL) ? 0 : ' ',
237 * Check these. And note how it doesn't do the summer-time conversion.
239 * In my world, it's always summer, and things are probably a bit off
242 static const struct {
246 } timezone_names[] = {
247 { "IDLW", -12, 0, }, /* International Date Line West */
248 { "NT", -11, 0, }, /* Nome */
249 { "CAT", -10, 0, }, /* Central Alaska */
250 { "HST", -10, 0, }, /* Hawaii Standard */
251 { "HDT", -10, 1, }, /* Hawaii Daylight */
252 { "YST", -9, 0, }, /* Yukon Standard */
253 { "YDT", -9, 1, }, /* Yukon Daylight */
254 { "PST", -8, 0, }, /* Pacific Standard */
255 { "PDT", -8, 1, }, /* Pacific Daylight */
256 { "MST", -7, 0, }, /* Mountain Standard */
257 { "MDT", -7, 1, }, /* Mountain Daylight */
258 { "CST", -6, 0, }, /* Central Standard */
259 { "CDT", -6, 1, }, /* Central Daylight */
260 { "EST", -5, 0, }, /* Eastern Standard */
261 { "EDT", -5, 1, }, /* Eastern Daylight */
262 { "AST", -3, 0, }, /* Atlantic Standard */
263 { "ADT", -3, 1, }, /* Atlantic Daylight */
264 { "WAT", -1, 0, }, /* West Africa */
266 { "GMT", 0, 0, }, /* Greenwich Mean */
267 { "UTC", 0, 0, }, /* Universal (Coordinated) */
268 { "Z", 0, 0, }, /* Zulu, alias for UTC */
270 { "WET", 0, 0, }, /* Western European */
271 { "BST", 0, 1, }, /* British Summer */
272 { "CET", +1, 0, }, /* Central European */
273 { "MET", +1, 0, }, /* Middle European */
274 { "MEWT", +1, 0, }, /* Middle European Winter */
275 { "MEST", +1, 1, }, /* Middle European Summer */
276 { "CEST", +1, 1, }, /* Central European Summer */
277 { "MESZ", +1, 1, }, /* Middle European Summer */
278 { "FWT", +1, 0, }, /* French Winter */
279 { "FST", +1, 1, }, /* French Summer */
280 { "EET", +2, 0, }, /* Eastern Europe, USSR Zone 1 */
281 { "EEST", +2, 1, }, /* Eastern European Daylight */
282 { "WAST", +7, 0, }, /* West Australian Standard */
283 { "WADT", +7, 1, }, /* West Australian Daylight */
284 { "CCT", +8, 0, }, /* China Coast, USSR Zone 7 */
285 { "JST", +9, 0, }, /* Japan Standard, USSR Zone 8 */
286 { "EAST", +10, 0, }, /* Eastern Australian Standard */
287 { "EADT", +10, 1, }, /* Eastern Australian Daylight */
288 { "GST", +10, 0, }, /* Guam Standard, USSR Zone 9 */
289 { "NZT", +12, 0, }, /* New Zealand */
290 { "NZST", +12, 0, }, /* New Zealand Standard */
291 { "NZDT", +12, 1, }, /* New Zealand Daylight */
292 { "IDLE", +12, 0, }, /* International Date Line East */
295 static int match_string(const char *date, const char *str)
299 for (i = 0; *date; date++, str++, i++) {
302 if (toupper(*date) == toupper(*str))
311 static int skip_alpha(const char *date)
316 } while (isalpha(date[i]));
321 * Parse month, weekday, or timezone name
323 static int match_alpha(const char *date, struct tm *tm, int *offset)
327 for (i = 0; i < 12; i++) {
328 int match = match_string(date, month_names[i]);
335 for (i = 0; i < 7; i++) {
336 int match = match_string(date, weekday_names[i]);
343 for (i = 0; i < ARRAY_SIZE(timezone_names); i++) {
344 int match = match_string(date, timezone_names[i].name);
345 if (match >= 3 || match == strlen(timezone_names[i].name)) {
346 int off = timezone_names[i].offset;
348 /* This is bogus, but we like summer */
349 off += timezone_names[i].dst;
351 /* Only use the tz name offset if we don't have anything better */
359 if (match_string(date, "PM") == 2) {
360 tm->tm_hour = (tm->tm_hour % 12) + 12;
364 if (match_string(date, "AM") == 2) {
365 tm->tm_hour = (tm->tm_hour % 12) + 0;
370 return skip_alpha(date);
373 static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, struct tm *tm)
375 if (month > 0 && month < 13 && day > 0 && day < 32) {
376 struct tm check = *tm;
377 struct tm *r = (now_tm ? &check : tm);
380 r->tm_mon = month - 1;
385 r->tm_year = now_tm->tm_year;
387 else if (year >= 1970 && year < 2100)
388 r->tm_year = year - 1900;
389 else if (year > 70 && year < 100)
392 r->tm_year = year + 100;
398 specified = tm_to_time_t(r);
400 /* Be it commit time or author time, it does not make
401 * sense to specify timestamp way into the future. Make
402 * sure it is not later than ten days from now...
404 if ((specified != -1) && (now + 10*24*3600 < specified))
406 tm->tm_mon = r->tm_mon;
407 tm->tm_mday = r->tm_mday;
409 tm->tm_year = r->tm_year;
415 static int match_multi_number(unsigned long num, char c, const char *date,
416 char *end, struct tm *tm, time_t now)
419 struct tm *refuse_future;
422 num2 = strtol(end+1, &end, 10);
424 if (*end == c && isdigit(end[1]))
425 num3 = strtol(end+1, &end, 10);
432 if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
445 refuse_future = NULL;
446 if (gmtime_r(&now, &now_tm))
447 refuse_future = &now_tm;
451 if (is_date(num, num2, num3, NULL, now, tm))
454 if (is_date(num, num3, num2, NULL, now, tm))
457 /* Our eastern European friends say dd.mm.yy[yy]
458 * is the norm there, so giving precedence to
459 * mm/dd/yy[yy] form only when separator is not '.'
462 is_date(num3, num, num2, refuse_future, now, tm))
464 /* European dd.mm.yy[yy] or funny US dd/mm/yy[yy] */
465 if (is_date(num3, num2, num, refuse_future, now, tm))
467 /* Funny European mm.dd.yy */
469 is_date(num3, num, num2, refuse_future, now, tm))
477 * Have we filled in any part of the time/date yet?
478 * We just do a binary 'and' to see if the sign bit
479 * is set in all the values.
481 static inline int nodate(struct tm *tm)
483 return (tm->tm_year &
492 * We've seen a digit. Time? Year? Date?
494 static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt)
500 num = strtoul(date, &end, 10);
503 * Seconds since 1970? We trigger on that for any numbers with
504 * more than 8 digits. This is because we don't want to rule out
505 * numbers like 20070606 as a YYYYMMDD date.
507 if (num >= 100000000 && nodate(tm)) {
509 if (gmtime_r(&time, tm)) {
516 * Check for special formats: num[-.:/]num[same]num
523 if (isdigit(end[1])) {
524 int match = match_multi_number(num, *end, date, end, tm, 0);
531 * None of the special formats? Try to guess what
532 * the number meant. We use the number of digits
533 * to make a more educated guess..
538 } while (isdigit(date[n]));
540 /* Four-digit year or a timezone? */
542 if (num <= 1400 && *offset == -1) {
543 unsigned int minutes = num % 100;
544 unsigned int hours = num / 100;
545 *offset = hours*60 + minutes;
546 } else if (num > 1900 && num < 2100)
547 tm->tm_year = num - 1900;
552 * Ignore lots of numerals. We took care of 4-digit years above.
553 * Days or months must be one or two digits.
559 * NOTE! We will give precedence to day-of-month over month or
560 * year numbers in the 1-12 range. So 05 is always "mday 5",
561 * unless we already have a mday..
563 * IOW, 01 Apr 05 parses as "April 1st, 2005".
565 if (num > 0 && num < 32 && tm->tm_mday < 0) {
570 /* Two-digit year? */
571 if (n == 2 && tm->tm_year < 0) {
572 if (num < 10 && tm->tm_mday >= 0) {
573 tm->tm_year = num + 100;
582 if (num > 0 && num < 13 && tm->tm_mon < 0)
588 static int match_tz(const char *date, int *offp)
591 int hour = strtoul(date + 1, &end, 10);
592 int n = end - (date + 1);
600 min = 99; /* random crap */
601 } else if (*end == ':') {
603 min = strtoul(end + 1, &end, 10);
604 if (end - (date + 1) != 5)
605 min = 99; /* random crap */
606 } /* otherwise we parsed "hh" */
609 * Don't accept any random crap. Even though some places have
610 * offset larger than 12 hours (e.g. Pacific/Kiritimati is at
611 * UTC+14), there is something wrong if hour part is much
612 * larger than that. We might also want to check that the
613 * minutes are divisible by 15 or something too. (Offset of
614 * Kathmandu, Nepal is UTC+5:45)
616 if (min < 60 && hour < 24) {
617 int offset = hour * 60 + min;
625 static void date_string(unsigned long date, int offset, struct strbuf *buf)
633 strbuf_addf(buf, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
637 * Parse a string like "0 +0000" as ancient timestamp near epoch, but
638 * only when it appears not as part of any other string.
640 static int match_object_header_date(const char *date, unsigned long *timestamp, int *offset)
646 if (*date < '0' || '9' < *date)
648 stamp = strtoul(date, &end, 10);
649 if (*end != ' ' || stamp == ULONG_MAX || (end[1] != '+' && end[1] != '-'))
652 ofs = strtol(date, &end, 10);
653 if ((*end != '\0' && (*end != '\n')) || end != date + 4)
655 ofs = (ofs / 100) * 60 + (ofs % 100);
663 /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
664 (i.e. English) day/month names, and it doesn't work correctly with %z. */
665 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
669 unsigned long dummy_timestamp;
673 timestamp = &dummy_timestamp;
675 offset = &dummy_offset;
677 memset(&tm, 0, sizeof(tm));
689 !match_object_header_date(date + 1, timestamp, offset))
690 return 0; /* success */
693 unsigned char c = *date;
695 /* Stop at end of string or newline */
700 match = match_alpha(date, &tm, offset);
702 match = match_digit(date, &tm, offset, &tm_gmt);
703 else if ((c == '-' || c == '+') && isdigit(date[1]))
704 match = match_tz(date, offset);
714 /* do not use mktime(), which uses local timezone, here */
715 *timestamp = tm_to_time_t(&tm);
716 if (*timestamp == -1)
722 /* gmtime_r() in match_digit() may have clobbered it */
724 temp_time = mktime(&tm);
725 if ((time_t)*timestamp > temp_time) {
726 *offset = ((time_t)*timestamp - temp_time) / 60;
728 *offset = -(int)((temp_time - (time_t)*timestamp) / 60);
733 *timestamp -= *offset * 60;
734 return 0; /* success */
737 int parse_expiry_date(const char *date, unsigned long *timestamp)
741 if (!strcmp(date, "never") || !strcmp(date, "false"))
743 else if (!strcmp(date, "all") || !strcmp(date, "now"))
745 * We take over "now" here, which usually translates
746 * to the current timestamp. This is because the user
747 * really means to expire everything she has done in
748 * the past, and by definition reflogs are the record
749 * of the past, and there is nothing from the future
752 *timestamp = ULONG_MAX;
754 *timestamp = approxidate_careful(date, &errors);
759 int parse_date(const char *date, struct strbuf *result)
761 unsigned long timestamp;
763 if (parse_date_basic(date, ×tamp, &offset))
765 date_string(timestamp, offset, result);
769 void parse_date_format(const char *format, struct date_mode *mode)
771 if (!strcmp(format, "relative"))
772 mode->type = DATE_RELATIVE;
773 else if (!strcmp(format, "iso8601") ||
774 !strcmp(format, "iso"))
775 mode->type = DATE_ISO8601;
776 else if (!strcmp(format, "iso8601-strict") ||
777 !strcmp(format, "iso-strict"))
778 mode->type = DATE_ISO8601_STRICT;
779 else if (!strcmp(format, "rfc2822") ||
780 !strcmp(format, "rfc"))
781 mode->type = DATE_RFC2822;
782 else if (!strcmp(format, "short"))
783 mode->type = DATE_SHORT;
784 else if (!strcmp(format, "local"))
785 mode->type = DATE_LOCAL;
786 else if (!strcmp(format, "default"))
787 mode->type = DATE_NORMAL;
788 else if (!strcmp(format, "raw"))
789 mode->type = DATE_RAW;
791 die("unknown date format %s", format);
794 void datestamp(struct strbuf *out)
801 offset = tm_to_time_t(localtime(&now)) - now;
804 date_string(now, offset, out);
808 * Relative time update (eg "2 days ago"). If we haven't set the time
809 * yet, we need to set it from current time.
811 static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
816 tm->tm_mday = now->tm_mday;
818 tm->tm_mon = now->tm_mon;
819 if (tm->tm_year < 0) {
820 tm->tm_year = now->tm_year;
821 if (tm->tm_mon > now->tm_mon)
825 n = mktime(tm) - sec;
830 static void date_now(struct tm *tm, struct tm *now, int *num)
832 update_tm(tm, now, 0);
835 static void date_yesterday(struct tm *tm, struct tm *now, int *num)
837 update_tm(tm, now, 24*60*60);
840 static void date_time(struct tm *tm, struct tm *now, int hour)
842 if (tm->tm_hour < hour)
843 date_yesterday(tm, now, NULL);
849 static void date_midnight(struct tm *tm, struct tm *now, int *num)
851 date_time(tm, now, 0);
854 static void date_noon(struct tm *tm, struct tm *now, int *num)
856 date_time(tm, now, 12);
859 static void date_tea(struct tm *tm, struct tm *now, int *num)
861 date_time(tm, now, 17);
864 static void date_pm(struct tm *tm, struct tm *now, int *num)
875 tm->tm_hour = (hour % 12) + 12;
878 static void date_am(struct tm *tm, struct tm *now, int *num)
889 tm->tm_hour = (hour % 12);
892 static void date_never(struct tm *tm, struct tm *now, int *num)
898 static const struct special {
900 void (*fn)(struct tm *, struct tm *, int *);
902 { "yesterday", date_yesterday },
903 { "noon", date_noon },
904 { "midnight", date_midnight },
908 { "never", date_never },
913 static const char *number_name[] = {
914 "zero", "one", "two", "three", "four",
915 "five", "six", "seven", "eight", "nine", "ten",
918 static const struct typelen {
925 { "days", 24*60*60 },
926 { "weeks", 7*24*60*60 },
930 static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num, int *touched)
932 const struct typelen *tl;
933 const struct special *s;
934 const char *end = date;
937 while (isalpha(*++end))
940 for (i = 0; i < 12; i++) {
941 int match = match_string(date, month_names[i]);
949 for (s = special; s->name; s++) {
950 int len = strlen(s->name);
951 if (match_string(date, s->name) == len) {
959 for (i = 1; i < 11; i++) {
960 int len = strlen(number_name[i]);
961 if (match_string(date, number_name[i]) == len) {
967 if (match_string(date, "last") == 4) {
976 int len = strlen(tl->type);
977 if (match_string(date, tl->type) >= len-1) {
978 update_tm(tm, now, tl->length * *num);
986 for (i = 0; i < 7; i++) {
987 int match = match_string(date, weekday_names[i]);
989 int diff, n = *num -1;
992 diff = tm->tm_wday - i;
997 update_tm(tm, now, diff * 24 * 60 * 60);
1003 if (match_string(date, "months") >= 5) {
1005 update_tm(tm, now, 0); /* fill in date fields if needed */
1006 n = tm->tm_mon - *num;
1017 if (match_string(date, "years") >= 4) {
1018 update_tm(tm, now, 0); /* fill in date fields if needed */
1019 tm->tm_year -= *num;
1028 static const char *approxidate_digit(const char *date, struct tm *tm, int *num,
1032 unsigned long number = strtoul(date, &end, 10);
1039 if (isdigit(end[1])) {
1040 int match = match_multi_number(number, *end, date, end,
1043 return date + match;
1047 /* Accept zero-padding only for small numbers ("Dec 02", never "Dec 0002") */
1048 if (date[0] != '0' || end - date <= 2)
1054 * Do we have a pending number at the end, or when
1055 * we see a new one? Let's assume it's a month day,
1056 * as in "Dec 6, 1992"
1058 static void pending_number(struct tm *tm, int *num)
1064 if (tm->tm_mday < 0 && number < 32)
1065 tm->tm_mday = number;
1066 else if (tm->tm_mon < 0 && number < 13)
1067 tm->tm_mon = number-1;
1068 else if (tm->tm_year < 0) {
1069 if (number > 1969 && number < 2100)
1070 tm->tm_year = number - 1900;
1071 else if (number > 69 && number < 100)
1072 tm->tm_year = number;
1073 else if (number < 38)
1074 tm->tm_year = 100 + number;
1075 /* We screw up for number = 00 ? */
1080 static unsigned long approxidate_str(const char *date,
1081 const struct timeval *tv,
1089 time_sec = tv->tv_sec;
1090 localtime_r(&time_sec, &tm);
1098 unsigned char c = *date;
1103 pending_number(&tm, &number);
1104 date = approxidate_digit(date-1, &tm, &number, time_sec);
1109 date = approxidate_alpha(date-1, &tm, &now, &number, &touched);
1111 pending_number(&tm, &number);
1114 return update_tm(&tm, &now, 0);
1117 unsigned long approxidate_relative(const char *date, const struct timeval *tv)
1119 unsigned long timestamp;
1123 if (!parse_date_basic(date, ×tamp, &offset))
1125 return approxidate_str(date, tv, &errors);
1128 unsigned long approxidate_careful(const char *date, int *error_ret)
1131 unsigned long timestamp;
1137 if (!parse_date_basic(date, ×tamp, &offset)) {
1142 gettimeofday(&tv, NULL);
1143 return approxidate_str(date, &tv, error_ret);
1146 int date_overflows(unsigned long t)
1150 /* If we overflowed our unsigned long, that's bad... */
1155 * ...but we also are going to feed the result to system
1156 * functions that expect time_t, which is often "signed long".
1157 * Make sure that we fit into time_t, as well.
1160 return t != sys || (t < 1) != (sys < 1);