Calculating the time between two choice columns

[Ian-S]

Hi all, 

I have two choice columns (start time, end time) where the options are times (e.g. not a proper time picker). I have a column with a formula in SharePoint that works out the duration between the two selected times.  Its: =TEXT([End Time]-[Start Time],"hh:mm")

Can I use that formula in PowerApps? If so, I can add a label but where do I put the formula? If not, how can I show the user the duration before submitting to SharePoint? 

Thank you in advance!

[WarrenBelz · Accepted solution]

Hi @Ian-S ,

Try the below. Replace with your drop-down control names. I have also assumed the Items are Choices().

DateDiff(
   DateTimeValue(StartTimeDD.Selected.Value),
   DateTimeValue(EndTimeDD.Selected.Value),
   Hours
)

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