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Question regarding Accumulative Sums

Hi

I have a scenario I'm trying to solve. I have one column with timestamps for when someone walks into a "room" and another column when someone walks out. I need to be able to calculate how many ppl are in the room at any given moment. I have connected a master calendar to the set-up.

A Timestamp = 1 event. Several events occur per day. I was thinking of keeping it simple and calculate the net number of events per day.

Therefore,

I need to calculate the accumulated number of events up-to the day I choose in the calender and I need it to change automatically when day is changed in the calender.

Thank you very much for and any help.

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