Calculated Column that adds 15 minutes to a date


I rarely implement calculated columns, but I am in need to do one to add 15 minutes to a StartDate column.  I did this, but it is adding three hours to the result: = StartTimeDate + .625.  Seems like this would be easy, but I must be overlooking something.  Thanks for the information

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EDIT: I actually figured it out. It is = StartTimeDate + 15/(24*60)