Documentation / date-formats.txton commit tag.c: implement '--format' option (df09474)
   1DATE FORMATS
   2------------
   3
   4The GIT_AUTHOR_DATE, GIT_COMMITTER_DATE environment variables
   5ifdef::git-commit[]
   6and the `--date` option
   7endif::git-commit[]
   8support the following date formats:
   9
  10Git internal format::
  11        It is `<unix timestamp> <time zone offset>`, where `<unix
  12        timestamp>` is the number of seconds since the UNIX epoch.
  13        `<time zone offset>` is a positive or negative offset from UTC.
  14        For example CET (which is 2 hours ahead UTC) is `+0200`.
  15
  16RFC 2822::
  17        The standard email format as described by RFC 2822, for example
  18        `Thu, 07 Apr 2005 22:13:13 +0200`.
  19
  20ISO 8601::
  21        Time and date specified by the ISO 8601 standard, for example
  22        `2005-04-07T22:13:13`. The parser accepts a space instead of the
  23        `T` character as well.
  24+
  25NOTE: In addition, the date part is accepted in the following formats:
  26`YYYY.MM.DD`, `MM/DD/YYYY` and `DD.MM.YYYY`.