On which date Bangladesh introduced bay light savings timing?

On which date Bangladesh introduced bay light savings timing? Correct Answer June 18, 2009

Bangladesh started DST at 11pm (23:00) local time on June 19, 2009, when the clocks moved one hour forward to midnight (00:00) between June 19 and June 20. Bangladesh observed DST in hope of saving energy throughout the country. The government hoped that DST would help save electricity in the evening.
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