Does the date of your last login stay constant or just the time? If the date is not changing, it sounds like it could be a database (SQL?) problem - that field in your record could be locked.
If the date is changing, then I am lost. Timestamps are usually one number/string and not split into date and time fields.
Maybe your database entry is locked. Can you change other personal settings (e-mail addrs, sig, &c)?
The forum operator should be able to find an error in the logs when the system tries to update your login timestamp. May need to turn on database error logging.
It doesn't sound like a browser problem to me. The last login time should be forum server time (+ TZ offset) and not based on your home system's clock.
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