Time Zone History

Guyana time zone history

Since 1970 it has also used UTC−3:45, an offset that is not a whole number of hours. Guyana has changed its standard time twice since 1970, tied second-most among the 19 zones on UTC−4 standard time.

UTC−4

Standard time is UTC−4 all year under the current rules.

tz database name America/Guyana

Convert a time from Guyana

Twice a new standard time since 1970

UTC−4: today’s standard timeUTC−3:52:39, UTC−3:45: ahead of today’s standard timeUTC−3: 1 hour ahead of today’s standard timeUTC−4: today’s standard timeUTC−3:52:39, UTC−3:45: ahead oftoday’s standard timeUTC−3: 1 hour ahead of today’sstandard time

How to read this chart

Before 1970

190019201940196019001940
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
August 1, 1911Local mean time (UTC−3:52:39) replacedUTC−4numeric only
March 1, 1915Standard time forward 15 minutesUTC−3:45numeric only
Since 1970
August 1, 1975Standard time forward 45 minutesUTC−3numeric only
March 29, 1992Standard time back 1 hourUTC−4numeric only

Also on UTC−4

Boa Vista (Brazil), Barbados, Martinique, Venezuela, Manaus (Brazil), Puerto Rico, Dominican Republic, Porto Velho (Brazil), Cuiabá (Brazil) and Bolivia (nearest first; 8 more on the list of offsets).

Clocks next door since 1970

  • Suriname (349 km): usually 1 hour ahead; different on 8,123 days in 1970–1992.
  • Boa Vista (Brazil) (522 km): same time except 7,927 days in 1970–1992, 1999 and 2000.
  • French Guiana (678 km): usually 1 hour ahead; different on 8,123 days in 1970–1992.
  • Barbados (718 km): same time except 7,517 days in 1970–1992.
  • Martinique (924 km): same time except 7,948 days in 1970–1992.

How it compares

On standard time, clocks in Guyana run 7 minutes behind local mean solar time.