Indian/Chagos

Time zone identifier: Indian/Chagos

Current civil offset: +06:00 (+06)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1906-12-31

Local Mean Time (LMT): +04:49:40 based on geographic meridian

Total recorded transitions: 2 transitions across 3 distinct offsets

Associated countries: IO

Historical Offset Step Chart (1880 to Present)

Text summary: Indian/Chagos shifted between 3 distinct offsets from 1906-12-31 through the modern era.

Complete Transition History (2 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1906-12-31T19:10:20Z`	`1907-01-01 00:10:20`	+04:49:40 → +05:00	`+05`	No	gap
`1995-12-31T19:00:00Z`	`1996-01-01 01:00:00`	+05:00 → +06:00	`+06`	No	gap

Notes from the Maintainers

Source: asia (Lines 242 to 249)

British Indian Ocean Territory
Whitman and the 1995 CIA time zone map say 5:00, but the
1997 and later maps say 6:00.  Assume the switch occurred in 1996.
We have no information as to when standard time was introduced;
assume it occurred in 1907, the same year as Mauritius (which
then contained the Chagos Archipelago).
Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]

Years on Record

Methodology Note: The 1970 Rule

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.