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Return the week number based on when Jan 1 started

  1. 09-24-2021, 05:32 PM #1
    Conabear
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    Return the week number based on when Jan 1 started

    Hi

    I have built an interactive calendar that will change when a new year in entered. I also want to identify the week number and have it change with the year. The first week of the year would be one where Jan 1 is on a Wednesday or earlier.
    I tried using WEEKNUM(C7,1) but it only works correctly when Jan 1 is a Sunday. If Jan 1 is on a Monday it counts that week ae WEEK 53 and the second week shows as WEEK 2 .
    In my sample if you enter year 2017 it works perfectly, but if you put in 2018 or higher (up to 2024) it does not work.
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  2. 09-24-2021, 06:06 PM #2
    bsalv
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    Re: Return the week number based on when Jan 1 started

    that is the european way, ISO-week ???
    Jan 4 is always in week 1 !

    =WEEKNUMMER(C7,21)
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  3. 09-24-2021, 09:09 PM #3
    josephteh
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    Re: Return the week number based on when Jan 1 started

    See if ISOWEEKNUM gives you the correct solution you are looking for.

    ISOWEEKNUM.png
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  4. 09-25-2021, 03:32 PM #4
    Conabear
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    Re: Return the week number based on when Jan 1 started

    Thank you
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  5. 09-25-2021, 06:04 PM #5
    AliGW
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    Re: Return the week number based on when Jan 1 started

    If that takes care of your original question, please select Thread Tools from the menu link above and mark this thread as SOLVED.

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