build

Fix date format validator to allow non-str objects #1535

Job	Run time
'mypy' on py3.x	26s
test-sdist	1m 48s
'twine-check' on py3.x	22s
ensure-catalog-matches-hook-config	20s
'py-mindeps' on py3.9	30s
Self-Check	16s
Test on ubuntu, py3.12	1m 50s
Test on ubuntu, py3.10	1m 55s
Test on ubuntu, py3.13	1m 57s
Test on ubuntu, py3.9	1m 51s
Test on ubuntu, py3.11	1m 41s
Test on windows, py3.13	2m 44s
Test on windows, py3.10	2m 40s
Test on windows, py3.11	2m 47s
Test on macos, py3.10	1m 36s
Test on windows, py3.12	2m 51s
Test on macos, py3.9	1m 27s
Test on macos, py3.11	1m 13s
Test on windows, py3.9	3m 7s
Test on macos, py3.12	1m 31s
Test on macos, py3.13	1m 25s
Collate results to check for skipped tests	8s
	34m 25s

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