Time Zone History

British Indian Ocean Territory time zone history

On standard time, clocks at the Chagos Archipelago run 1 hour 10 minutes ahead of local mean solar time, the largest gap of the 5 zones on UTC+6 standard time whose clocks run ahead of the sun. Local mean time, UTC+4:49:40, ended in 1907.

UTC+6

Standard time is UTC+6 all year under the current rules.

tz database name Indian/Chagos

Convert a time from British Indian Ocean Territory

Once a new standard time since 1970

UTC+4:49:40, UTC+5: behind today’s standard timeUTC+6: today’s standard timeUTC+4:49:40, UTC+5: behind today’sstandard timeUTC+6: today’s standard time

How to read this chart

Before 1970

190019201940196019001940
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
January 1, 1907Local mean time (UTC+4:49:40) replacedUTC+5numeric only
Since 1970
January 1, 1996Standard time forward 1 hourUTC+6numeric only

Also on UTC+6

Bangladesh, Bhutan, Kyrgyzstan, Ürümqi (China) and Omsk (Russia).

Clocks next door since 1970

  • Maldives (1,284 km): usually 1 hour behind; different on 9,496 days in 1970–1995.
  • Sri Lanka (1,788 km): usually 30 minutes ahead; different on 11,169 days in 1995–2026; 30 minutes behind today.
  • Mauritius (2,149 km): usually 2 hours behind; different on 9,650 days in 1970–1995, 2008 and 2009.
  • Singapore (3,616 km): usually 2 hours ahead; different on 9,496 days in 1970–1995.
  • Pakistan (3,627 km): usually 1 hour behind; different on 10,031 days in 1970–1995, 2002, 2008 and 2009.