Time Zone History

French Guiana time zone history

On standard time, clocks in Cayenne run 29 minutes ahead of local mean solar time. Local mean time, UTC−3:29:20, ended in 1911.

UTC−3

Standard time is UTC−3 all year under the current rules.

tz database name America/Cayenne

Convert a time from French Guiana

UTC−3 every day since 1970

UTC−4: 1 hour behind today’s standard timeUTC−3:29:20: 29 minutes behind today’s standard timeUTC−3: today’s standard timeUTC−4: 1 hour behind today’sstandard timeUTC−3:29:20: 29 minutes behindtoday’s standard timeUTC−3: today’s standard time

How to read this chart

Before 1970

190019201940196019001940
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
July 1, 1911Local mean time (UTC−3:29:20) replacedUTC−4numeric only
October 1, 1967Standard time forward 1 hourUTC−3numeric only

Also on UTC−3

Suriname, Belém (Brazil), Santarém (Brazil), Araguaína (Brazil), Fortaleza (Brazil), Recife (Brazil), Maceió (Brazil), Bahia (Brazil), São Paulo (Brazil) and Paraguay (nearest first; 19 more on the list of offsets).

Clocks next door since 1970

  • Suriname (329 km): same time except 5,387 days in 1970–1984.
  • Guyana (678 km): usually 1 hour behind; different on 8,123 days in 1970–1992.
  • Belém (Brazil) (829 km): same time except 350 days in 1985–1988.
  • Santarém (Brazil) (866 km): usually 1 hour behind; different on 7,115 days in 1985–1988 and 2008–2026; same time today.
  • Boa Vista (Brazil) (954 km): usually 1 hour behind; different on 504 days in 1985–1988, 1999 and 2000.

How it compares

French Guiana has kept UTC−3 since 1967, with no clock changes since 1970.