We have an application that displays timestamps for things that have already happened - creation, last edit, activity history.
We have a customer where the source for these events (a user triggering an action) may be in a different timezone, and they've asked us to append timezone information to the display. The majority of our other customers work in one timezone.
The times are always displayed in device-local time, so there would be no logic changes but rather simply the addition of the devices current timezone appended to the end of the timestamp on screen.
Is it good practice to do this, or is there a better way to convey this information?