Merge pull request #1195 from herwinw/date_mon #1745

Job	Run time
RuboCop	25s
specs (ubuntu, 3.0.6)	1m 28s
specs (ubuntu, 3.1.4)	1m 29s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 33s
specs (macos, 3.0.6)	1m 44s
specs (macos, 3.1.4)	1m 54s
specs (macos, 3.2.2)	1m 35s
specs (macos, 3.3.0)	1m 33s
specs (windows, 3.0.6)	5m 11s
specs (windows, 3.1.4)	4m 3s
specs (windows, 3.2.2)	5m 36s
specs (windows, 3.3.0)	3m 50s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 23s
	33m 9s

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