Duration serde now human readable + Display of Epoch is now Gregorian in its initialization time scale #513

Job	Run time
Check	9s
Lints	17s
Test Suite (ubuntu-latest, MSRV)	2m 34s
no-std build (aarch64-unknown-none)	23s
Test Suite (ubuntu-latest, stable)	2m 27s
no-std build (thumbv6m-none-eabi)	20s
Test Suite (macos-latest, MSRV)	3m 22s
Test Suite (macos-latest, stable)	8m 21s
Test Suite (windows-latest, MSRV)	8m 59s
Test Suite (windows-latest, stable)	8m 56s
Coverage	29s
Release	0s
	36m 17s

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