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The following <https://www.pulumi.com/docs/reference/pkg/google-native/container/v1/cluster/#recurringtimewindow|recurringTimeWindow> may help even though this resource is in gcp preview.  The same format should work.
`start time = 2019-01-01T09:00:00-0400`
`end time = 2019-01-01T17:00:00-0400`