from datetime import datetime
from pytz import timezone

if __name__ == "__main__":
    d = datetime(2012, 12, 21, 9, 30, 0)
    print(d)

    central = timezone('US/Central')
    loc_d = central.localize(d)
    print(loc_d)

    bang_d = loc_d.astimezone(timezone("Asia/Kolkata"))
    print(bang_d)