Rolling count for last 365 days


Hi All,

I am very new to Smart Sheet and hope you can help. I would like to keep a count of entries into 7 columns (one per employee) for the last 365 days. The count will update each day to only reflect the last 365 days. The entries will simply be the number 1 in a column if that day should be counted for the employee. So basically for the screen shot attached (assuming the dat column continues to end of 2021) I would like to know how many 1's are in the 7 named columns for the last 365 days from the current day. I have looked at COUNTIF and TODAY-365 but to be honest am stuck. Any help appreciated.

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