Question

why is bangladesh half an hour ahead of india

Answer 1

Explanation:

This is because the sun rises at different times in each country. Even we have but I'm lag of 2 hours from Arunachal Pradesh to Gujarat but we have taken time in Indian Standard Meridian do the entire nation. In the same way Bangladesh experience is sunrise half an hour earlier than us .

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Answer 2

Answer:

Bangladesh standard time(BST) is technically UTC(+6:00). Indian standard time(IST) is usually UTC(+5:30) . So there is a 30 minute difference there. India nor Bangladesh observes DST(Day light saving) and therefore always have a 30 min gap.

Now let me get to your question. Time zones are based on the longitude where the country is.

India is spread out in both length and breadth wise. So India spreads along two different time zones +UTC5:00 and UTC+6:00. But India wanted to go ahead with a same time throughout the whole country and therefore came up with UTC+5:30 which is the average of the above. Though this works fairly nicely for all the other parts of India it does not work well for the north eastern states. They actually tend to fall more likely into the new time zone of +UTC6:30. And as recently as 2014 Assam(one of the north eastern state started using a new time zone).

Bangladesh falls under the UTC+6:00 and they chose to have that as their time zone.

Here is the time zone layout updated by Aug 2015 and this will clearly show how different are the time zones between India and Bangladesh and also within India.