Bangladesh follows Bangladesh Standard Time, UTC+06:00 — a single zone covering the whole country, with no daylight saving, so the clock reads the same everywhere in Bangladesh and never moves.
That is the whole answer. What follows is the detail people usually want next: the one year Bangladesh did change its clocks, and how far ahead it sits of the places it gets compared with.
One zone, one offset
The IANA time zone database — the reference phones, servers and booking systems read their offsets from — lists exactly one zone under the country code BD: Asia/Dhaka, at a standard offset of UTC+06:00. There is no second zone and no regional variation, which is why the Bangladesh country page on this site shows one clock for the country rather than a list of them.
Locally the offset is written BST, for Bangladesh Standard Time. Be careful with those three letters in international email: British Summer Time uses the same abbreviation and sits five or six hours away depending on the season. Writing UTC+06:00 removes the ambiguity entirely.
The one year Bangladesh used daylight saving
Bangladesh has observed daylight saving time exactly once, in 2009.
The time zone database holds two rules for the country and no others: clocks went forward by one hour at 23:00 on 19 June 2009, and went back at the end of 31 December 2009. The measure was brought in to ease an electricity shortage, and the database's own notes record that the cabinet cancelled the arrangement in March 2010. No rule has applied since, and the zone has been fixed at UTC+06:00 from 2010 onward.
The practical consequence is that any schedule involving Bangladesh is stable. Nothing on the Bangladeshi side will shift under you twice a year.
How far ahead is Bangladesh?
The gap only moves when the other country changes its clocks. Taken from this site's own city pages:
| Compared with | Their offset | Bangladesh is |
|---|---|---|
| Delhi, India | UTC+05:30 | 30 minutes ahead |
| Lagos, Nigeria | UTC+01:00 | 5 hours ahead |
| London, United Kingdom | UTC+00:00 today | 6 hours ahead |
London is the row to watch. It is on Greenwich Mean Time at the moment, six hours behind Dhaka, and it moves to UTC+01:00 on 28 March 2027 — from that morning the gap narrows to five hours, without anything in Bangladesh having moved. India and Nigeria hold their offsets all year, so those two rows never change.
Why India is half an hour behind, not a whole hour
Most national offsets are whole hours, so the thirty-minute gap between Dhaka and Delhi catches people out.
India Standard Time is UTC+05:30, one of a small set of offsets built on a half hour rather than a whole one. Bangladesh is on a whole-hour offset, UTC+06:00. The difference between the two is therefore 30 minutes — a fact about India's choice of offset rather than about Bangladesh's.
Worked through, using 09:00 in Dhaka as the starting point:
- Delhi: 6:00 − 5:30 = 0:30, so 08:30.
- Lagos: 6:00 − 1:00 = 5:00, so 04:00.
- London, while GMT is in force: 6:00 − 0:00 = 6:00, so 03:00.
Checking a specific date
Because one side of almost every pair does change its clocks, the gap you want is the gap on the date of the meeting, not the gap today. The time zone converter resolves a pair against both cities' current rules, and the Dhaka clock shows the live local time, UTC offset and daylight-saving status on its own.
The short version
- Bangladesh follows Bangladesh Standard Time, UTC+06:00.
- One IANA zone covers the whole country: Asia/Dhaka.
- There is no daylight saving. The only exception ran from 19 June to 31 December 2009 and was cancelled in 2010.
- Bangladesh is 30 minutes ahead of India, 5 hours ahead of Nigeria, and 6 hours ahead of the UK while GMT is in force.