It's not perfect because other things will count as modifying your entry, but this could help a little
When you mark a game as played, that is modifying the entry
So, pull up your owned collection.
Click on Columns and check mark the box next to Last Modified (then click on Done)
Then click on filters, choose Played and select Yes (then click on Apply Filters)
That should pull up all games you have marked as played with the last modified date (which should be the last time you played the game - unless you did something else to that entry - like rated the game)
You can also click on the column which says last modified to flip it between ascending and descending
This does not seem to be correct. As an example I played Vinci last week for the first time in a number of years and I recorded the play. The last modified date is still shown as May 2015 when I changed my rating of the game.