A standard time zone is defined as a geographical area or region throughout which the same standard time is observed.

A time zone item specifies an international time zone, indicated by an abbreviation (small set of letters).

Military time zone designations use a single letter of the alphabet (J is not used).

Zulu Time (Z) is Greenwich Mean Time (GMT).

Time Zones east of the Prime Meridian at Greenwich, London

Standard time zone abbreviations with examples, indexed by the zone hour value (time difference or offset relative to GMT) and the equivalent military designations

CLOCKS FOR ALL 25 GMT OFFSETS

Time Zones West of Greenwich

HISTORY OF TIME ZONES