Install gworldclock by entering the following commands in the terminal:
sudo apt update sudo apt install gworldclock
Description:
Displays time and date in specified time zones
This program displays the time and date of specified time zones using a GTK+ interface. It also provides a "rendezvous" function allowing the zones to be synchronised to a time other than the current time. This can help you organise meetings across different timezones. . The time zones may be entered by hand in TZ format or chosen from a list prepared from /usr/share/zoneinfo/zone.tab. The zone list is kept in a format consistent with the shell script tzwatch.
Version: 1.4.4-11
Section: universe/utils