Time Zone History

São Tomé and Príncipe time zone history

On standard time, clocks at São Tomé run 27 minutes behind local mean solar time, the seventh-largest gap of the 79 zones whose clocks run behind the sun. The latest change of standard time came on January 1, 2019, from UTC+1 to UTC+0.

UTC+0

Standard time is UTC+0 (GMT) all year under the current rules.

tz database name Africa/Sao_Tome

Convert a time from São Tomé and Príncipe

Twice a new standard time since 1970

UTC−0:36:45: 37 minutes behind today’s standard timeUTC+0: today’s standard timeUTC+0:26:56: 27 minutes ahead of today’s standard timeUTC+1: 1 hour ahead of today’s standard timeUTC−0:36:45: 37 minutes behindtoday’s standard timeUTC+0: today’s standard timeUTC+0:26:56: 27 minutes ahead oftoday’s standard timeUTC+1: 1 hour ahead of today’sstandard time

How to read this chart

Before 1970

18801900192019401960188019201960
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
January 1, 1884Standard time back 1 hour 4 minutesUTC−0:36:45LMT
December 31, 1911Local mean time (UTC−0:36:45) replacedUTC+0GMT
Since 1970
January 1, 2018Standard time forward 1 hourUTC+1WAT
January 1, 2019Standard time back 1 hourUTC+0GMT

Also on UTC+0

Côte d’Ivoire, Liberia, Guinea-Bissau, Western Sahara, Canary Islands (Spain), Morocco, Madeira (Portugal), Lisbon (Portugal), United Kingdom and Faroe Islands (nearest first; 2 more on the list of offsets).

Clocks next door since 1970

  • Nigeria (774 km): usually 1 hour ahead; different on 365 days in 2018 and 2019.
  • Côte d’Ivoire (1,318 km): same time except 365 days in 2018 and 2019.
  • Chad (1,600 km): usually 1 hour ahead; different on 511 days in 1979, 1980, 2018 and 2019.
  • Liberia (2,054 km): same time except 1,101 days in 1970–1972, 2018 and 2019.
  • Guinea-Bissau (2,776 km): same time except 2,191 days in 1970–1975, 2018 and 2019.