When you need to know when a change was made to an Employee's timesheet entry, or which user was the one who made the changes, this info can be found in the Timesheet History menu.
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To the right of a timesheet entry, click the 3 dots to open the Timesheet menu. At the bottom of this menu is the History link.

By clicking on 'History', you can view a popup window detailing who made any changes to an entry, and when they were made.

NB: Any timesheet entry that has been edited by an Employee and needs approval will show in bold on the Timesheet.