Test

fix: Improve date parsing (fractional seconds, UTC offsets) #4666

Job	Run time
Check	3s
Features	21s
Runtimes	32s
Bootstrap (debug)	3m 45s
Compiler (ubuntu, node current)	1m 50s
Bootstrap (release)	3m 30s
Coverage	3m 8s
Compiler (ubuntu, node lts/*)	1m 56s
Loader	19s
Compiler (macos, node current)	1m 38s
Compiler (macos, node lts/*)	1m 38s
Compiler (windows, node current)	1m 54s
Compiler (windows, node lts/*)	1m 48s
	22m 22s

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