I noticed prior to the current update (2020.02.17.0), that all of my inventory reports generated at earlier dates now always show the current date and time.
So, if I performed a report a year ago and another 6 months on a PC and attempt to run another, both of the previous reports show today's date and time.
What you see in the image are two previous Inventory Reports. 
2020-07-20_105230.png
Hello,
Thank you for reporting this issue. We will take a look to see what's going on. If we need more information to reproduce this, we will post back in this thread.
Regards,
Hubert Mireault
We found what the issue is, and we've made a fix. This fix will be available starting from RDM 2020.2.18.0.
As a note, this should only be a visual issue as far as we can tell, so the correct dates should appear again starting with 2020.2.18.0.
Regards,
Hubert Mireault