date: fix parse_datetime 0.13 API compatibility issues #1319

Job	Run time
Style/format (ubuntu-latest, feat_os_unix)	18s
Style/lint (macos-latest, feat_os_macos)	1m 55s
Style/lint (ubuntu-latest, all, true)	4m 43s
Style/lint (windows-latest, feat_os_windows)	5m 11s
Style/spelling (ubuntu-latest, feat_os_unix)	3m 33s
Style/Python	8s
Style/toml	12s
Pre-commit hooks	42s
	16m 42s

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