Capital: Dhaka · Single time zone (BST, UTC+6) · one of the most densely populated Muslim-majority countries in the world.
METHOD: UNIVERSITY OF ISLAMIC SCIENCES, KARACHIBangladesh sits entirely within one time zone (BST, UTC+6), and geographically it's compact enough — under 800 km at its widest — that prayer times shift only gradually from Sylhet in the northeast to Khulna in the southwest, mostly a matter of a few minutes rather than the large regional swings seen in bigger countries.
Mosques and the government-recognised Islamic Foundation Bangladesh publish national Ramadan calendars each year based on the same University of Islamic Sciences, Karachi convention this page uses — the same method common across the wider South Asian region.
The Islamic Foundation Bangladesh, a government-affiliated body, publishes the national Sehri and Iftar calendar each year, based on the same calculation convention used on this page.
Not much compared to larger countries — Bangladesh's compact geography means times typically differ by only a few minutes between its eastern and western cities on the same day.