[PATCH v3 0/2] More ISO-8601 support

This series aims to extend support for ISO-8601 datetime format to allow compact version, and fractional part of ISO-8601.

Changes from v2:
* Add example for fractional parts of second in documentation
* Add/Fix regression test on 12:34:56.7.days.ago

Đoàn Trần Công Danh (2):
  date.c: skip fractional second part of ISO-8601
  date.c: allow compact version of ISO-8601 datetime

 Documentation/date-formats.txt |  5 ++++-
 date.c                         | 32 +++++++++++++++++++++++++++++++-
 t/t0006-date.sh                |  6 ++++++
 3 files changed, 41 insertions(+), 2 deletions(-)

Range-diff against v2:
1:  03f3e9968b ! 1:  c6d42785bb date.c: skip fractional second part of ISO-8601
    @@ Documentation/date-formats.txt: RFC 2822::
      	Time and date specified by the ISO 8601 standard, for example
      	`2005-04-07T22:13:13`. The parser accepts a space instead of the
     -	`T` character as well.
    -+	`T` character as well. The fractional part will be ignored.
    ++	`T` character as well. Fractional parts of a second will be ignored,
    ++	for example `2005-04-07T22:13:13.019` will be treated as
    ++	`2005-04-07T22:13:13`
    ++
      +
      NOTE: In addition, the date part is accepted in the following formats:
      `YYYY.MM.DD`, `MM/DD/YYYY` and `DD.MM.YYYY`.
     
      ## date.c ##
     @@ date.c: static int match_multi_number(timestamp_t num, char c, const char *date,
    + 	/* Time? Date? */
    + 	switch (c) {
      	case ':':
    - 		if (num3 < 0)
    +-		if (num3 < 0)
    ++		if (num3 < 0) {
      			num3 = 0;
    -+		else if (*end == '.' && isdigit(end[1]))
    ++		} else if (*end == '.' && isdigit(end[1]) &&
    ++			   tm->tm_year != -1 && tm->tm_mon != -1 &&
    ++			   tm->tm_mday != -1) {
    ++			/* Attempt to guess meaning of <num> in HHMMSS.<num>
    ++			 * only interpret as fractional when %Y %m %d is known.
    ++			 */
     +			strtol(end + 1, &end, 10);
    ++		}
      		if (num < 25 && num2 >= 0 && num2 < 60 && num3 >= 0 && num3 <= 60) {
      			tm->tm_hour = num;
      			tm->tm_min = num2;
    @@ t/t0006-date.sh: check_parse 2008-02 bad
      check_parse '2008-02-14 20:30:45 -0015' '2008-02-14 20:30:45 -0015'
      check_parse '2008-02-14 20:30:45 -5' '2008-02-14 20:30:45 +0000'
      check_parse '2008-02-14 20:30:45 -5:' '2008-02-14 20:30:45 +0000'
    +@@ t/t0006-date.sh: check_approxidate 5.seconds.ago '2009-08-30 19:19:55'
    + check_approxidate 10.minutes.ago '2009-08-30 19:10:00'
    + check_approxidate yesterday '2009-08-29 19:20:00'
    + check_approxidate 3.days.ago '2009-08-27 19:20:00'
    ++check_approxidate '12:34:56.3.days.ago' '2009-08-27 12:34:56'
    + check_approxidate 3.weeks.ago '2009-08-09 19:20:00'
    + check_approxidate 3.months.ago '2009-05-30 19:20:00'
    + check_approxidate 2.years.3.months.ago '2007-05-30 19:20:00'
2:  36517af872 = 2:  225b6401bd date.c: allow compact version of ISO-8601 datetime