How do I configure my ZoneTick to display GMT (UTC, Zulu) time?
By default ZoneTick shows three clocks after installation: local time (the time zone your computer is set to) on the desktop, London, and local time in taskbar. London uses a time zone with daylight saving on, which is not equal to GMT during the summer. To have a GMT clock unmark the “Adjust for daylight saving time” option for your London clock and change its label from London to GMT.