Cannot use datetimes before UNIX epoch on Windows

Bắt đầu với dòng được liên kết trong py-pgproto's codecs/datetime.pyx và so sánh hành vi của dòng này với issue CPython Windows được tham chiếu. Tái hiện việc bind datetime.datetime(1969, 12, 31) thông qua executemany() trên Windows. Hoàn tất khi các datetimes trước UNIX epoch không còn gây ra OSError trong quá trình mã hóa.

• asyncpg version: 0.29.0
• PostgreSQL version: 15.5
• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?: Local PostgreSQL install
• Python version: 3.10.1
• Platform: Windows
• Do you use pgbouncer?: No
• Did you install asyncpg with pip?: Yes
• If you built asyncpg locally, which version of Cython did you use?: N/A
• Can the issue be reproduced under both asyncio and
  uvloop?: N/A

If I have this query:

INSERT INTO process.start_and_end (user_id, process_id, start_dt, end_dt) VALUES  ($1, $2, $3, $4);

and in Python I do:

await conn.executemany(query, [(1325, 1001, datetime.datetime(1969, 12, 31, 0, 0), None)])

this line throws the following exception:

Traceback (most recent call last):
  File "asyncpg\protocol\prepared_stmt.pyx", line 175, in asyncpg.protocol.protocol.PreparedStatementState._encode_bind_msg
  File "asyncpg\protocol\codecs/base.pyx", line 227, in asyncpg.protocol.protocol.Codec.encode
  File "asyncpg\protocol\codecs/base.pyx", line 129, in asyncpg.protocol.protocol.Codec.encode_scalar
  File "asyncpg\pgproto\./codecs/datetime.pyx", line 222, in asyncpg.pgproto.pgproto.timestamptz_encode
OSError: [Errno 22] Invalid argument

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "main.py", line 919, in <module>
    loop.run_until_complete(async_main())
  File "C:\Scoop\apps\python\current\lib\asyncio\base_events.py", line 641, in run_until_complete
    return future.result()
  [...]
  File "main.py", line 401, in __insert_tape
    await conn.executemany(query, [(1325, 1001, datetime.datetime(1969, 12, 31, 0, 0), None)])
  File ".venv\lib\site-packages\asyncpg\connection.py", line 391, in executemany
    return await self._executemany(command, args, timeout)
  File ".venv\lib\site-packages\asyncpg\connection.py", line 1911, in _executemany
    result, _ = await self._do_execute(query, executor, timeout)
  File ".venv\lib\site-packages\asyncpg\connection.py", line 1945, in _do_execute
    result = await executor(stmt, None)
  File "asyncpg\protocol\protocol.pyx", line 267, in bind_execute_many
  File "asyncpg\protocol\coreproto.pyx", line 974, in asyncpg.protocol.protocol.CoreProtocol._bind_execute_many_more
  File "asyncpg\protocol\protocol.pyx", line 230, in genexpr
  File "asyncpg\protocol\prepared_stmt.pyx", line 204, in asyncpg.protocol.protocol.PreparedStatementState._encode_bind_msg
asyncpg.exceptions.DataError: invalid input for query argument $3 in element #0 of executemany() sequence: datetime.datetime(1969, 12, 31, 0, 0) ([Errno 22] Invalid argument)

Digging into it a bit more, I found that the culprit is this line in the codec for datetime objects, which is related to this old CPython issue on Windows: https://github.com/python/cpython/issues/80940.

The fix looks quite simple, but unfortunately I do not have the time to work on that, so I'm opening an issue instead of a PR.