Tests

Fixed an invalid input handle for DateTimeConverter #49

Job	Run time
build-docs	31s
lint	13s
build-package	31s
unit-test (3.10, ubuntu-latest)	27s
unit-test (3.13, macos-latest)	18s
unit-test (3.11, macos-latest)	19s
unit-test (3.11, ubuntu-latest)	23s
unit-test (3.10, windows-latest)	1m 8s
unit-test (pypy3.10, ubuntu-latest)	1m 2s
unit-test (3.12, macos-latest)	35s
unit-test (pypy3.10, windows-latest)	3m 57s
unit-test (3.12, windows-latest)	1m 0s
unit-test (3.13, windows-latest)	1m 20s
unit-test (3.9, windows-latest)	1m 38s
unit-test (pypy3.10, macos-latest)	54s
unit-test (3.9, ubuntu-latest)	28s
unit-test (3.11, windows-latest)	1m 11s
unit-test (3.13, ubuntu-latest)	28s
unit-test (3.10, macos-latest)	40s
unit-test (3.12, ubuntu-latest)	37s
unit-test (3.9, macos-latest)	45s
	18m 25s

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