Create a new scenario in Make (formerly Integromat).
Select your "Master" board from the first dropdown.
In the second dropdown, select the board you want to update.
In the "Action" field, select "Update Column."
In the "Column" field, select the date column you want to update.
In the "Value" field, select the date column you want to update from the "Master" board.
Save and run your scenario.
You have a board for tracking sales leads and another board for tracking sales opportunities. You want to update the "Opportunity Created" column on the sales opportunities board whenever a new lead is created on the sales leads board.