Tests

Fixed an invalid input handle for DateTimeConverter #46

Job	Run time
build-docs	31s
build-package	38s
lint	14s
unit-test (3.9, macos-latest)	42s
unit-test (3.10, windows-latest)	54s
unit-test (3.10, macos-latest)	40s
unit-test (3.11, macos-latest)	34s
unit-test (3.13, ubuntu-latest)	26s
unit-test (3.9, ubuntu-latest)	37s
unit-test (3.12, macos-latest)	23s
unit-test (3.13, windows-latest)	1m 4s
unit-test (3.12, windows-latest)	1m 1s
unit-test (3.11, windows-latest)	1m 12s
unit-test (3.10, ubuntu-latest)	25s
unit-test (pypy3.10, windows-latest)	1m 58s
unit-test (pypy3.10, macos-latest)	1m 2s
unit-test (3.9, windows-latest)	1m 30s
unit-test (3.12, ubuntu-latest)	45s
unit-test (3.11, ubuntu-latest)	26s
unit-test (3.13, macos-latest)	21s
unit-test (pypy3.10, ubuntu-latest)	48s
	16m 11s

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