Thanks Variatus. I made a few adjustments to the previous sample file in order to get the "Last Updated" timestamp to work the way I need it to. I took your advice and put a VBA on the actual data sheet, and then link that timstamp cell to the summary sheet. Now the timestamp works fine, but since I am using a different VBA code than before, I need to know from this current point, what I need to do to get the Timestamp cells on the Summary sheet to highlight yellow when the linked data is changed. Is there a conditional formatting formula that can be applied to highlight a cell if its current value is greater than it's previous value. Since we're dealing with time, the change in these particular cells will always be greater than they were previously. Or is there a VBA code that can highlight a cell when it's value changes even though the change event in the cell actually occurs on another sheet. Secondly, I'd like to use a Form Control Button to clear the highlight on that particular row and return the cell next to that button to no fill color. I'd like this to happen regardless of if the cell is highlighted automatically or manually. Can you provide a Macro code for this as well. In the new Sample Worksheet, we will only focus on the Termite Treatment row 15, and the timestamp cells that I want to highlight are in Column "O" on the Summary Sheet. The Button to clear the corresponding timestamp highlight is in Column "P". Any urgent help would be much appreciated.