If you are looking for the starting date of new Islamic year 1441 AH in Bangladesh then read this article.
New Islamic year 1441 AH is started from the evening of August 31. However, the final decision was made after the moon sighting. The local moon sighting authorities conducted the meeting regrading the moon sighting and announced the decision.
Bangladesh is among the key Islamic countries and a large number of Muslims here observe Ashura and pay tribute to Hazrat Imam Hussain and his companions who were martyred on 10th Muharram.