formatDateTimeISO() fix (#2010) #2258

Job	Run time
units / 🧪 Unit Tests	14m 40s
typecheck / typecheck	4m 47s
publish-worker / build (coordinator)	1m 32s
publish-worker / build (docker-provider)	50s
publish-webapp / publish	3m 19s
publish-worker / build (kubernetes-provider)	41s
	25m 49s

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