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The world is divided into basically 24 time zones. For easy reference in communications, a letter of the alphabet has been assigned to each time zone. The "clock" at Greenwich, England is used as the standard clock for international reference of time in communications, military, aviation, maritime and other activities that cross time zones. The letter designator for this clock is Z.

Times written in military time (24 hour format) are four digits, such as, 1830Z (6:30 pm) with the Zulu suffix. Note that the phonetic alphabet is used for the letter Z (Zulu). This time is usually referred to as Zulu Time because of the letter assigned to this time zone. Its official name is Coordinated Universal Time or UTC. This time zone had previously been called Greenwich Mean Time (GMT) but was replaced with UTC in 1972 as the official world time standard changed. While GMT is based on Earth's rotation and celestial measurements, UTC is a based on cesium-beam atomic clocks. The two clocks are rarely more than a second apart as leap seconds are applied to UTC.

TopFlight Models Featuring Zulu Time:

Charles Hubert Triple Time Zone Watch
Triple Time Zone Watch (2)
Citizen World Perpetual A-T
World Perpetual A-T (1)
Citizen Chrono Time A-T
Chrono Time A-T (2)
Citizen Pilot's Flight Perpetual Calendar Alarm Chronograph Watches
Pilot's Flight Perpetual Calendar Alarm Chronograph Watches (2)
Citizen World Time A-T
World Time A-T (3)
Citizen Promaster Air, Pilot's World Time Flight Computer
Promaster Air, Pilot's World Time Flight Computer (2)
Citizen Ladies World Time A-T Watches
Ladies World Time A-T Watches (6)
Citizen SailHawk Eco-Drive Chronograph Yacht Timer Watch
SailHawk Eco-Drive Chronograph Yacht Timer Watch (2)
Citizen Nighthawk Pilot's Eco-Drive Watches
Nighthawk Pilot's Eco-Drive Watches (3)
Citizen Satellite Wave GPS F900 World Time Chronograph Watches
Satellite Wave GPS F900 World Time Chronograph Watches (2)
Citizen Blue Angels Skyhawk AT
Blue Angels Skyhawk AT (1)
Citizen Perpetual Chrono A-T
Perpetual Chrono A-T (6)
Traser Green Spirit
Green Spirit (1)
Traser P59 Aurora Pilot's GMT Watch with Tritium Illumination and a True 24 Dial
P59 Aurora Pilot's GMT Watch with Tritium Illumination and a True 24 Dial (2)