I have some date/time cells in Excel and I would like to add a certain amount of time onto them (savinng the new value in another cell). Here is how it would look:
Main sheet:

Sheet3:

So in the main sheet, for column E I want to match the main’s column D with column B in Sheet3 and based on that add column C (Sheet3) to the date in column C (main sheet) then store the new date in main’s column E.
Column C (sheet3) represents the amount of hours to be added.
How to go about that?
Place this formula in column E of your main sheet:
Assuming you want to add days. If you want to add seconds or hours, you’ll need to adjust the time in column C of Sheet 3.