The timezone for Sri Lanka is SLST or Sri Lanka Standard Time. So if you want to know what time is it in Sri Lanka now then you will have to contact SLST.
However, generally speaking, the standard time of Sri Lanka is 5 hours and 30 minutes ahead of UTC or GMT. But do you know what are UTC and GMT?
What is GMT?
Earlier it was calculated in different ways and at different times like according to the situation of the lunar system. For this reason, in the past, it was not used find out the time of an area precisely unless a context in this regard is available.
What is UTC?
UTC is the abbreviation of Coordinated Universal Time which is considered as the basic standard time which is used all over the world to regulate time zones as well as clocks.
Its accuracy is nearly 1 second of mean time of the solar system at 0-degree longitude and cannot be adjusted for saving time for daylight.
History of Sri Lankan time zone
The time of Sri Lanka varied between +05:30 and +06:30 to UTC since 1880 as in this year it was +05:30 to UTC.
However, it was shifted to UTC+06:00 in January 1942, when the Ceylon was being invaded by the Japanese. But, in September 1942, the standard time of Sri Lanka was again advanced to +06:30 to UTC.
In 1945, after the end of World War II, the standard time of Sri Lanka was reverted to UTC+05:30 to be on the same slab as that of India. But, due to severe power shortage, the Sri Lankan government again changed its standard time to UTC+06:30 in May 1996 for saving daylight.
However, in October 1996, they changed back their clocks by 30 minutes to make their standard time for UTC+06:00. In April 2006 they again changed back their time zone by another 30 minutes to be in UTC+05: 30-time zone.
By entering into this time zone the Sri Lankan government tried to be in line with the time zone of India.
Sri Lanka decided to remain in the time zone of India since then.
It helped them to calculate their standard time on the basis of the Indian Standard Time calculated in India by Allahabad Observatory at the reference point of GMT, at 82-degree longitude in the East of Greenwich. Today this time zone is used throughout Sri Lanka to share the same time.
A difference of time with Sri Lanka
Los Angeles 12.5 hours behind the time of Sri Lanka whereas New York is 9.5 hours back and London is 5.5 hours back which is equivalent to UTC−5.5 hours.
Similarly, Paris is 4.5 hours back and Istanbul and Moscow are 2.5 hours back and Dubai is 1.5 hour back. India is in the same time zone so it is at par with Sri Lanka but Beijing and Singapore are 2.5 hours ahead of it.
Similarly, Tokyo is 3.5 and Sydney is 5.5 hours ahead of Sri Lanka.
Thus you can easily know what time is it in Sri Lanka right now.