Counting missing dates

Hello!

I have a submission table that lists dates of a submission and an associated “office” to each submission. I also have an Office tab that takes all the submission data with other rollups. There can be multiple submissions a day to the same or multiple offices. I want to use a rollup to gather the number of missing dates from a specified project start date (in this case 3/28/2022) as these would be weather or maintenance delays (and I’m trying to see if there is a formula that will automatically calculate this).

Thank you!

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