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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 Pilot's Flight Perpetual Calendar Alarm Chronograph Watches
Pilot's Flight Perpetual Calendar Alarm Chronograph Watches (2)
Citizen Chrono Time A-T
Chrono Time A-T (2)
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 World Perpetual A-T
World Perpetual A-T (1)
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 World Time A-T
World Time A-T (3)
Citizen Blue Angels Skyhawk AT
Blue Angels Skyhawk AT (2)
Citizen Perpetual Chrono A-T
Perpetual Chrono A-T (6)
Citizen Skyhawk Watch, Pilot's Watch, AT Atomic Time
Skyhawk Watch, Pilot's Watch, AT Atomic Time (1)
H3 Tactical Stealth Mission Pilot's GMT Watches
Stealth Mission Pilot's GMT Watches (1)
Pulsar Racing GMT Chronograph with 100 Lap Memory
Racing GMT Chronograph with 100 Lap Memory (1)
Torgoen Swiss T30 Collection ZULU Time Alarm Pilot's Watches
T30 Collection ZULU Time Alarm Pilot's Watches (4)
Traser Green Spirit
Green Spirit (1)
Traser Blue Infinity
Blue Infinity (1)