palmOne TREOTM TreoTM 650 Using Manual page 182

5. On your computer, open Palm Desktop software and correct the wrong entries.
6. Manually enter any information you've added to your phone since the last time
you synchronized.
7. Go to the Calendar conduit dialog box, and select Desktop overwrites handheld.
8. Synchronize your phone and your computer.
9. Go to the conduit dialog box, and select Synchronize the files.
To avoid this problem in the future, do not assign time zones to your events.
Palm Desktop software does not support time zones.
180 :: Synchronization (HotSync)