Is there a way to see the history of your ranking of a film

@bderoes​  Thanks for your help; there is no need to create a new separate list though -- this is exactly what the predefined "Check-ins" list can do for you. 

@JonnyNich  Please see https://help.imdb.com/article/imdb/social/check-ins-faq/GG59ELYW45FMC7J3

For example, my ratings list at https://www.imdb.com/user/ur1000000/ratings records every movie I have seen since 1 January 1980 with one entry per movie, always with the latest rating and date. We launched check-ins in August 2011 and my list of non-unique movie viewings since then, along with the date of each viewing is at https://www.imdb.com/user/ur1000000/checkins 

Hope this helps. 

@Col_Needham​, @JonnyNich 

Checkins does have the advantage of listing the date-added above each title (with custom lists, you have to view that in Edit mode, or Export), and Jonny can add the rating in the description field as can be done on a custom list.

On the desktop version of IMDb, there is not a special button to add to Check-ins, so second and subsequent adds need to be done in Edit mode, not via the drop-down, as with custom lists.

Also worth noting: Check-ins has a smaller list of Refine options than does a custom list, and I don't see how to retrieve a unique list identifier so that another user's Check-ins could be included in an Advanced Title Search, as can be done with custom lists. 

@bderoes​  Thanks, that’s a good point on recording a second check-in on desktop.  I use the IMDb iOS app for all of my list activities.