I assume you mean the computer date and time in the bottom right corner? As I said, the computer time is showing correctly and has always remained showing the correct time.
Apologies, as it is a fairly new computer, it is the Outlook app.
On my wife's laptop, Windows mail keeps changing the time zone to UTC -8.00 Pacific Time. Despite being changed back to the correct timezone, a couple of days later, the time zone gets changed again. The computer time and time zone remains correct. Any suggestions?
The easy option I guess...