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Mountain Standard Time Abbreviation This time zone is a daylight saving/summer time zone, in the winter some places will switch to the corresponding standard time zone: MST (Mountain Standard. Time Zone Abbreviations. Mountain Standard Time - is abbreviated as MST Mountain Daylight Time - is abbreviated as MDT. Here is an explanation of the time zone abbreviations used internationally and locally: GMT - Greenwich Mean Time UTC - Universal Coordinated Time (the same as GMT). The initials are in the "wrong" order because they stand for the French translation. A time zone is a region on Earth that has a uniform standard time for legal, commercial, and social purposes. It is convenient for areas in close commercial or other communication to keep the same time, so time zones tend to follow the boundaries of countries and their subdivisions. The Table of Post Offices encouraged people to spell out the entire name of the state, but who has time to do that? People commonly wrote out abbreviations for the states, but without a standard system in place, it would be too easy to confuse, say, Miss for Mississippi and Miss for Missouri. The Table gave a list of accepted abbreviations to ... So while time zone names and abbreviations are interesting, if you really want to ensure someone knows what time zone you are referring to, it is best to use the GMT offset. The following information on this page divides time zones into 2 charts.