TZThe TZ environment variable changes the selected timezone for the duration of a command (or at least commands that are aware of TZ). It’s handy to use with the date command:
$ date
Tue May 5 09:34:58 EDT 2026
$ TZ=UTC date
Tue May 5 13:34:58 UTC 2026I actually added alias utc="TZ=UTC date" to my shell so that I can double-check the time when I’m looking at logs with UTC times.