Add Dates compat. Tag v0.9.24. #62

Job	Run time
Documentation	2m 48s
Julia 1.0 - ubuntu-latest - x64 - push	51s
Julia 1.0 - windows-latest - x64 - push	5m 18s
Julia 1.0 - macOS-latest - x64 - push	2m 1s
Julia 1.6 - ubuntu-latest - x64 - push	51s
Julia 1.6 - windows-latest - x64 - push	7m 14s
Julia 1.6 - macOS-latest - x64 - push	1m 14s
Julia 1.7 - ubuntu-latest - x64 - push	49s
Julia 1.7 - windows-latest - x64 - push	2m 2s
Julia 1.7 - macOS-latest - x64 - push	1m 20s
Julia 1 - ubuntu-latest - x64 - push	1m 7s
Julia 1 - windows-latest - x64 - push	1m 33s
Julia 1 - macOS-latest - x64 - push	1m 15s
Julia nightly - ubuntu-latest - x64 - push	2m 11s
Julia nightly - windows-latest - x64 - push	2m 18s
Julia nightly - macOS-latest - x64 - push	1m 56s
	34m 48s

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