The today pane is highlighting the last time the app was opened, not today's date. Same problem as https://support.mozilla.org/en-US/questions/1368124 and https://support.mozilla.org/en-US/questions/1210583. I am on 102.3.0 64-bit with Windows 10. Everything is up to date. My pc calendar is correct and the time zone is correct. Thunderbird knows the correct date since when I go into settings, the Date Text Format is showing today's date, not the date that is highlighted. I tried renaming xulstore.json and session.json as was suggested on a previous thread.