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Power Apps - Building Power Apps
Answered

DateDiff Function Error

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Posted on by 4,704 Super User 2025 Season 1

I am using the following condition in the Text property of a Gallery Label field.

 

When the Gallery fields are populated with data there is no error (in development view).

 

When there is no data in the Gallery fields the error (shown below) appears. 

 

     Gallery / DaystoRenewalFld / Text Property:

     Lookup(DaystoRenewalCollection,ClassTitles=ThisItem.CQTitle).DaystoRenewal - DateDiff((ThisItem.DteofCQ),Today(),Days)

 

     Power Apps Error Message:

     "The first argument to the DateDiff function cannot be blank."

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  • Phineas Profile Picture
    4,704 Super User 2025 Season 1 on at
    Re: DateDiff Function Error

    Sorry, just getting back to this; yes, your recommendation did clear the error message. Thank you.

  • WarrenBelz Profile Picture
    146,651 Most Valuable Professional on at
    Re: DateDiff Function Error

    Hi @Phineas ,

    Just checking if you got the result you were looking for on this thread. Happy to help further if not.

    Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

  • Verified answer
    WarrenBelz Profile Picture
    146,651 Most Valuable Professional on at
    Re: DateDiff Function Error

    @Phineas ,

    That is because DatDiff() requires a date to be valid. Try this

    If(
     Value(ThisItem.DteofCQ)>0,
     Lookup(
     DaystoRenewalCollection,
     ClassTitles=ThisItem.CQTitle
     ).DaystoRenewal - 
     DateDiff(
     ThisItem.DteofCQ,
     Today(),
     Days
     ),
     0
    )

     

    Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

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