Changelog:
===========
- fix appveyor builds by installing current project
- Move datetime-specific code from date methods into datetime class
- Add Python 3.13 support and drop Pyhton 3.8 support
- Fix compare datetime with diffrent timezones
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
