Datetime

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- Nothing changed yet.

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- Change pickle format to export the microseconds as an int, to
solve a problem with dates after 2038.
(`56 <https://github.com/zopefoundation/DateTime/issues/56>`_)

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- Fix ``UnknownTimeZoneError`` when unpickling ``DateTime.DateTime().asdatetime()``.
(`58 <https://github.com/zopefoundation/DateTime/issues/58>`_)

- Repair equality comparison between DateTime instances and other types.
(`60 <https://github.com/zopefoundation/DateTime/issues/60>`_)

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- Add support for Python 3.12.

- Add preliminary support for Python 3.13a2.

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- Cast int to float in compare methods.
- Fix compare methods between DateTime instances and None.
(`52 <https://github.com/zopefoundation/DateTime/issues/52>`_)

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- Add missing ``python_requires`` to ``setup.py``.