Is there a way to specify a maintenance window for a specific date and time rather than a blackout period?
Unfortunately, not at this time. That sounds like a good feature request though!
Check this one out as I think it comes close to what you want (idea expanded upon by GCP).
Thanks for the reply but that doesn't fit my need. DBAs will need to remember to remove the blackout period once the maintenance is over. This is not ideal. Enhancement please!
If you scroll down, you will see that gcp suggested the "occurs once" option. Did you vote it up?