2.15 pm IST (When it's 2:15 in India, it's 2:15 in India.)
1640 GMT is 21:10 Indian Standard Time (IST). India is 5 hours and 30 minutes ahead of GMT, so you add that to the GMT time to get the equivalent IST time.
India Time - Indian Standard Time (IST) UTC/(GMT) +5.5
9 AM IST
If it is 12am in CST, it would be 11:30am IST. India Standard Time (IST) is 11.5 hours ahead of Central Standard Time (CST).
8pm india time
1.45 PM EST is 11.15 PM IST. India is 9.5 hours ahead of Eastern Standard Time.
9 AM Central European Time (CET) = 9 AM Irish Summer Time (IST) = 10 AM Israel Standard Time (IST) = 1:30 PM India Standard Time (IST)
All of India is covered by the IST timezone.
4 PM India Standard Time (IST) = 10:30 AM Greenwich Mean Time (GMT) 4 PM Israel Standard Time (IST) = 2 PM GMT 4 PM Irish Summer Time (IST) = 3 PM GMT
India is in the IST time zone (GMT +5.30) meaning it is 5 hours and 30 minutes ahead of GMT. Therefore, 1700 GMT is 2230 IST.
6 AM Mountain Standard Time (MST) = 2 PM Irish Summer Time (IST) = 3 PM Israel Standard Time (IST) = 6:30 PM India Standard Time (IST)