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Editorial Team
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Asked: 2026-05-26T08:13:58+00:00

I used the ISDATE() Function to check whether a value is a Date. but

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I used the ISDATE() Function to check whether a value is a Date. but when i put 9966 or any four digit numeric, the function returns true

  1. why it happens like that?
  2. what is the best way to check a value whether it is a date?
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1 Answer

  1. Editorial Team

    Yes, ISDATE() function will not be reliable in some cases. So, you should learn How to Handle ISDATE() with care

    the values in a ISDATE functions are first casted to datetime

    and

    if varchar datatype is used to stored formatted dates (ex YYYYMMDD),
    to check if it is valid date, you need not only to use ISDATE()
    function, but also use LEN() function

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