Update Date / Time when a specific cell is modified

[A-IT]

I would like to create an automated flow with the trigger being "When an item or a file is modified". I would like it to trigger only when a specific cell is modified. The modified cell is a "Person or Group" so we can use internal information. I want the flow only to trigger when that cell is modified. This will be at a later Date / Time than when the row will be created. When this cell is modified, I want the Date / Time of the modification to appear in the "Test Date" cell. 

I have created a flow that does run, but it triggers when any cell is modified in the row. This is not acceptable because the Date / Time needs to be an accurate Time Stamp to use. I have been using a small script in the triggers such as :
@equals(triggerOutputs()?['body/Status/Value'], 'Closed')
to initiate the flow on a specific instance. It won't work for this thought because it will be people and not a list or Yes/No that I could easily quantify. Any help on how to go about making the trigger only happen when "Test Person" is modified would be great!

[mobashee]

Dear Partner,

You can enable the version and check the last and current version.

Regards,

Mohamed Sanuj Basheer

[A-IT]

Thank you for the response. How would I make the flow check if that cell has been updated or not?

[A-IT · Accepted solution]

I believe I found a good solution. I turned on versioning for the list. I used the "Get Changes for an item or file (properties only)" action and then a condition for the cell that I wanted "Has column changed:xxx" is equal to true.