There have been a couple of partner blog posts speculating about the background of the recent Domino 13.12.2024 problem, which might be a bit misleading.
For the background of what happened in detail and how HCL addressed the problem please wait for the official technote update.
But what I can tell is that HCL fixed it on a lower level function addressing all functionality in Domino and business partner applications using the effected functionality.
This means the only safe way is to apply the Interim fix provided by HCL for all supported releases including the extended support versions!
What I also can state is that all Notes TIMEDATE functionality is working as intended and are designed to handle date times from 1.1.1 to the end of all times.
This is a companion discussion topic for the original entry at https://blog.nashcom.de/nashcomblog.nsf/dx/notes-timedate-explained.htm