support the following date formats:
Git internal format::
- It is `<unix timestamp> <timezone offset>`, where `<unix
+ It is `<unix timestamp> <time zone offset>`, where `<unix
timestamp>` is the number of seconds since the UNIX epoch.
- `<timezone offset>` is a positive or negative offset from UTC.
+ `<time zone offset>` is a positive or negative offset from UTC.
For example CET (which is 2 hours ahead UTC) is `+0200`.
RFC 2822::