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  • Riny_van_Eekelen's avatar
    Riny_van_Eekelen
    Platinum Contributor

    leannrobinsonelevateK 

    A conditional formatting formula like below will check is the week number of a date entered in A1 is less than the current week number minus 1 or on a particular date. In the formula I hard-coded September 1, 2022, but you could replace that by a reference to a cell that contains "a specific date".

    =OR(ISOWEEKNUM(A1)<ISOWEEKNUM(TODAY())-1,DATE(2022,9,1))

     

    In Excel for the web, it looks like this:

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