gkrellm-tz 0.8-1 (s390x binary) in ubuntu eoan

 This plugin displays the current time in several configurable
 timezones. It uses the standard names of timezones found under
 /usr/share/zoneinfo/, e.g. UTC. Timezones can also have descriptive
 labels which are shown as tooltips. Furthermore it's possible to define
 a custom time format.