|Sri Lanka Standard Time|
|04:33, 11 April 2021 SLST|
|Observance of DST|
|DST is not observed in this time zone.|
Sri Lanka Standard Time (SLST) (Sinhala: ශ්රී ලංකාවේ සම්මත වේලාව Shri Lankavay Sammatha Velava Tamil: இலங்கை நியம நேரம்) is the time zone for Sri Lanka. It is 5 hours and 30 minutes ahead of GMT/UTC (UTC+05:30).
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 to UTC+05:30 to be the same as India. But in May 1996, it was changed to UTC+06:30 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, though it was changed back again to UTC+05:30 in April 2006. By changing the time zone, the government hoped to bring the island in line with India. Sir Arthur C. Clarke, who was living in Sri Lanka at that time, protested against the switch, saying that it will make life inconvenient to everyone who has to relate to the rest of the world.