Ramadan Calendar 2022 is available here. You can see or download Ramadan ul Mubarak (Ramzan/ramadan) calendar to know iftar and sehri timetable of Bangladesh.
Ramadan Time-Table 2024, Hijri 1443 For Dhaka District (GMT +6)

(Source: Islamic Foundation Bangladesh)
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The Gregorian calendar is a solar calendar and the Islamic calendar is a lunar calendar, Ramadan is always on the same day of the Islamic calendar, however, the date on the Gregorian calendar is varies from year to year, also the day of Ramadan may vary from country to country depending on whether the moon has been sighted or not. In every year, Ramadan moves approximately 10-11 days in the Gregorian calendar.