Bug Report

Description

The parse_date function returns a wrong result, when using an RFC 2822 date with timezone.

In [24]: parse_date('Thu, 20 May 2021 13:38:44 +0300')
Out[24]: (1621517924, -10800)

This output is wrong.
1621517924 is supposed to be UTC time (10:38:44).
But instead, it is my time (13:38:44)

Source Code Investigation

The function calls are as following:

1. repo.index.commit takes author_date as input, which is an RFC 2822 string.
2. repo.index.commit calls Commit.create_from_tree with author_date.
3. Commit.create_from_tree calls parse_date(author_date) to parse the date into author_time and author_offset.
4. Commit.create_from_treecalls cls (aka Commit.__init__) passing author_time and author_offset.
5. Commit.__init__ saves author_time and author_offset in authored_date and author_tz_offset.

Thus, the fault should lie with the parse_date function.

Environment

Tried with versions 2.1.11 and 3.1.14.