IANA time zone database - time zone acronyms

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Changes related to location part

Components that specify a location

Length Code source Format Example Comment
2 ISO 3166-1 alpha-2 ccT
2 xxT Brazil - Fernando Noronha: FNT
2 xxST Lord Howe : LHST
2 xx%sT Several zones in Brazil that use Brasilia BRT (BR is also the ISO 3166-1 alpha-2 code)

Other: 

Kampala:
3:00	-	EAT	1930
2:30	-	BEAT	1948
2:45	-	BEAUT	1957
Aruba (in ISO 3166-1 AW)
-4:00	-	AST
GBGT	1966 May 26 # Br Guiana Time
NEGT	1975 Nov 20 # Dutch Guiana Time

Components that do not specify a location

position from right Letter Meaning Save Occurrence
1 T Time N/A always
2 D Daylight (Saving) 1:00 several
2 S Standard N/A several
2 S Summer 1:00 europe file: e.g. BST British Summer Time, CEST Central European Summer Time
2 W War 1:00 northamerica file: US and Mexico
2 P Peace 1:00 northamerica file: US
2 M Mean N/A
  • africa file: LMT # Lisbon Mean Time, FMT # Freetown Mean Time, PMT # Paris Mean Time
  • europe file: MMT # Moscow Mean Time
  • southamerica file: CMT # Cordoba Mean Time, CMT # Calamarca MT(!), QMT # Quito Mean Time, BMT # Bogota Mean Time, SMT # Stanley Mean Time, SMT # Santiago Mean Time, MMT # Montevideo MT(!), PMT # Paramaribo Mean Time, CMT # Caracas Mean Time
2 M Midsummer 2:00 europe file: Moscow - M # Midsummer, also for Spain, France, Germany/SovietZone
32 LM Local Mean N/A several
32 DS Double Summer 2:00 europe file: MDST # Moscow Double Summer Time, BDST - British Double Summer Time
32 DD Double Daylight (Saving) 2:00 northamerica file: StJohns 1988)
32 HS Half Summer 0:30
  • australasia file: Pacific/Rarotonga CK%sT and "HS"
  • southamerica file: Uruguay
32 HS Half Summer 0:20
  • africa file: Rule Ghana 1936-1942
32 HD Half Daylight (Saving) 0:30
  • northamerica file: Rule Belize 1918-1942
  • northamerica file: Rule DR 1969-1973
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