Bangladesh Standard Time

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This article is about the standard time zone of Bangladesh. It is not to be confused with British Standard Time.
BST in relation with the bordering nations.

Bangladesh Standard Time (BST) (Bengali: বাংলাদেশ মান সময়) is the time zone of Bangladesh. It is offset six hours ahead of Coordinated Universal Time, and is observed as a national standard time throughout the country. Bangladesh briefly observed daylight saving time (DST) in 2009 in order to cope with the ongoing electricity crisis, but in 2010 the decision was cancelled by the government of Bangladesh.

The official time signal is given by the Bangladesh Standard Time is calculated on the basis of 90.00° E longitude, which passes over the Harukandi Union of Harirampur Upazila of the Manikganj District in Dhaka Division, Bangladesh. In the IANA time zone database, it is represented by Asia/Dhaka.


Between 1858 and 1941, the Bengal region was under British Raj and used Calcutta time (UTC+5:53:20).[1]

For a brief period in the 1940s, amidst World War II, there were a series of time zone changes in British India.

  • In 1 October 1941, the region switched to using UTC+06:30.[1][2]
  • In 15 May 1942, the following year, the region switched to UTC+05:30. But by 1 September in the same year, it was returned to UTC+06:30.[1][2]

Following the independence of India in 1947, British India was partitioned into India and Pakistan, of which East Pakistan is now Bangladesh. The time zone of East Pakistan was not immediately affected by the partition, but Kolkata (previously Calcutta) of India switched to UTC+05:30 in 15 October 1945.[3]

In 1951, the region changed its time from UTC+06:30 to UTC+06:00, the time zone commonly used today.[1][4]

Daylight Saving Time[edit]

On 19 June 2009, the government of Bangladesh introduced – for the first time ever – the UTC+07:00 offset to utilize daylight savings. The time was advanced by exactly 1 hour at midnight, and was planned to be maintained for 7 months upto 31 December 2009. Prior to that, the country observed a time offset of UTC+06:00.[5]

The decision was not widely welcomed, as it initially created a lot of confusion and gradually forced citizens to face a change in their lifestyle. The country went back to its original time offset (UTC+06:00) by 1 January 2010. From 1 April 2010, DST was due to be observed, but the cabinet cancelled the decision permanently, deciding to remain in the UTC+06:00 offset.


  1. ^ a b c d "Bangladesh Starts Daylight Saving Time on June 19, 2009". Retrieved 2015-02-15.
  2. ^ a b "Time Changes in Dhaka over the years 1925–1949". Retrieved 2015-02-15.
  3. ^ "Time Changes in Kolkata over the years 1925–1949". Retrieved 2015-02-15.
  4. ^ "Time Changes in Dhaka over the years 1950–1959". Retrieved 2015-02-15.
  5. ^ Melik, James (19 June 2009). "Bangladesh adopts new time rules". BBC World Service. Retrieved 2009-06-20.

External links[edit]