Is there a way for data formula to not automatically update every time I open Excel. I don't want to turn on manual calculations as I want all other formulas to be updated in the worksheet wen I open.
Not if Date formula (ex. "TODAY()") is in same sheet as other calculations.
Work around is to use VBA to populate specific cell with date value.
In VBA "Date" serves same function as TODAY() in worksheet. So use a button or some other method to call the procedure when you want to update the date.
Alternately, you can set calculation for entire sheet to manual. Then use .Calculate in VBA for specific range. But I don't recommend this approach.