Board Thread:Support Requests - Getting Technical/@comment-9605025-20150320012450

I am working on improving the event infobox for the Tranformers Legends wiki. Some events occurred twice and thus have a second set of dates. I added a second set of properties to accommodate this. Since only some events (3, to be exact) occurred twice others do not use the additional properties. As in the past, I am assigning the properties using 'set' like so:

From previous experience, if a given field is not assigned, then the property should also remain unassigned. However, I recently noticed that when the property is of the type 'date', an unassigned value is replaced with the page's modification date. See here.

Have I missed something? I don't recall seeing this behavior before. Is there a work around? - EDIT: Some of the pages all have the same replacement date that is not the modification date. I am guessing that corresponds to the auto-management that is performed on wikis? 