GregorianCalendar ctor #561

Job	Run time
rust_ci (ubuntu-latest, beta)	58s
rust_ci (macos-latest, nightly)	2m 2s
rust_ci (macos-latest, stable)	50s
rust_ci (ubuntu-latest, stable)	50s
rust_ci (macos-latest, beta)	53s
rust_ci (windows-latest, beta)	1m 45s
rust_ci (ubuntu-latest, nightly)	1m 30s
rust_ci (windows-latest, stable)	2m 29s
rust_ci (windows-latest, nightly)	2m 44s
	14m 1s

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