The GIT_AUTHOR_DATE and GIT_COMMITTER_DATE environment variables
support the following date formats:
Git internal format
It is <unix timestamp> <time zone offset>, where <unix
timestamp> is the number of seconds since the UNIX epoch.
<time zone offset> is a positive or negative offset from UTC.
For example CET (which is 1 hour ahead of UTC) is +0100.
RFC 2822
The standard email format as described by RFC 2822, for
example Thu, 07 Apr 2005 22:13:13 +0200.
ISO 8601
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. 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.
In addition to recognizing all date formats above, the --date
option will also try to make sense of other, more human-centric
date formats, such as relative dates like "yesterday" or "last
Friday at noon".
