Sri Lanka Time
Encyclopedia
Sri Lanka Standard Time (SLST) is the time zone for Sri Lanka
Sri Lanka
Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka is a country off the southern coast of the Indian subcontinent. Known until 1972 as Ceylon , Sri Lanka is an island surrounded by the Indian Ocean, the Gulf of Mannar and the Palk Strait, and lies in the vicinity of India and the...

. It is 5 hour
Hour
The hour is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds...

s and 30 minute
Minute
A minute is a unit of measurement of time or of angle. The minute is a unit of time equal to 1/60th of an hour or 60 seconds. In the UTC time scale, a minute on rare occasions has 59 or 61 seconds; see leap second. The minute is not an SI unit; however, it is accepted for use with SI units...

s ahead of GMT/UTC (UTC+05:30).

The Sri Lanka Time reverted on 15 April 2006 to match Indian Standard Time
Indian Standard Time
Indian Standard Time is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. India does not observe daylight saving time or other seasonal adjustments, although DST was used briefly during the Sino–Indian War of 1962 and the Indo–Pakistani Wars of 1965 and 1971...

 calculated from the Allahabad Observatory
Allahabad Observatory
The Allahabad Observatory located in the town of Mirzapur, just outside Allahabad is the centre responsible for maintaining the Indian Standard Time . The observatory is located at 82.5°E longitude, which translates to an exact time difference of 5 hours and 30 minutes ahead of Coordinated...

 in India 82.5 ° longitude East of Greenwich
Greenwich
Greenwich is a district of south London, England, located in the London Borough of Greenwich.Greenwich is best known for its maritime history and for giving its name to the Greenwich Meridian and Greenwich Mean Time...

, the reference point for GMT.

The entire country shares the same time. Since 1880, Ceylon or Sri Lanka Time has varied between UTC+05:30 to UTC+06:30.

In 1880, it was UTC+05:30. During World War II, in January 1942, when the Japanese were on the verge of invading Ceylon, the time was shifted to UTC+06:00. In September 1942, it was further advanced to UTC+06:30.

When the War ended in 1945, Ceylon reverted back to UTC+05:30 to be the same as India.

In May 1996, it was changed to GMT+06:30 hrs for daylight saving during a severe power shortage in Sri Lanka. The clocks were put back by half an hour to UTC+06:00 in October 1996.

Currently Sri Lanka does not observe daylight saving time
Daylight saving time
Daylight saving time —also summer time in several countries including in British English and European official terminology —is the practice of temporarily advancing clocks during the summertime so that afternoons have more daylight and mornings have less...

, though it was used during the World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

.

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