Command clocks places additional time zones into your Mac status bar.

clocks is a Go program for MacOS systems.

Presming you have a working Go insallation, you can install clocks via:

go install github.com/tmc/clocks

Note: You should have $HOME/go/bin on your shell's PATH so that go installed binaries are directly executable.

$ clocks -h
Usage of clocks:
  -fmt string
    	time format string (golang time pkg) (default "Mon Jan 2 15:04 MST")
  -tzs string
    	time zones (default "UTC,America/Los_Angeles")

This is example output from running clocks: