fix(date): improve caching accuracy #3014

Job	Run time
Verify hyper.h is up to date	20s
semver	15s
Check Style	7s
Test with Miri	2m 40s
Check MSRV	25s
features	44s
Test stable on windows-latest	3m 7s
Test stable on ubuntu-latest	57s
Test stable on macOS-latest	54s
Test nightly on macOS-latest	1m 15s
Test beta on macOS-latest	1m 22s
Test beta on ubuntu-latest	1m 14s
Test nightly on ubuntu-latest	1m 9s
Test nightly on windows-latest	2m 14s
Test C API (FFI)	27s
udeps	25s
minimal-versions	29s
Test cargo-c support (FFI)	19s
Test beta on windows-latest	2m 21s
Build docs	23s
Check exposed types	24s
CI is green	4s
	21m 35s

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