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Chapter 7.
Time zones
9.47.
The following forms are to be used when abbreviating names of time zones:
- AKDT— Alaska daylight time
- AKST — Alaska standard time
- AKT — Alaska time (implies standard or daylight time)
- AST — Atlantic standard time
- AT— Atlantic time
- CDT — central daylight time
- CST — central standard time
- CT — central time
- DST — daylight saving (no "s") time
- EDT — eastern daylight time
- EST — eastern standard time
- ET — eastern time
- GCT — Greenwich civil time
- GMAT — Greenwich mean astronomical time
- GMT — Greenwich mean time
- HDT — Hawaii-Aleutian daylight time (not observed in HI)
- HST — Hawaii-Aleutian standard time
- LST — local standard time
- MDT — mountain daylight time
- MST — mountain standard time
- MT — mountain time
- PDT — Pacific daylight time
- PST — Pacific standard time
- PT — Pacific time
- UTC — coordinated universal time
Acronyms and coined words
9.48.
To obtain uniform treatment in the formation of acronyms and coined words, apply the formulas that follow:
- Use all capital letters when only the first letter of each word or selected words is used to make up the symbol:
- APPR (Army package power reactor)
- EPCOT (Experimental Prototype Community of Tomorrow)
- MAG (Military Advisory Group)
- MIRV (multiple independently targetable reentry vehicle)
- SALT (strategic arms limitation talks); (avoid SALT talks)
- STEP (supplemental training and employment program)
- Use all capital letters where first letters of prefixes and/or suffixes are utilized as part of established expressions:
- CPR (cardiopulmonary resuscitation)
- ESP (extrasensory perception)
- FLIR (forward-looking infrared)
- Copy must be followed where an acronym or abbreviated form is copyrighted or established by law:
- ACTION (agency of Government; not an acronym)
- MarAd (Maritime Administration)
- NACo (National Association of Counties)
- MEDLARS (Medical Literature Analysis and Retrieval System)
- Use caps and lowercase when proper names are used in shortened form, any word
