India Standard Time (IST) is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). Therefore, when it is 7:00 am at Greenwich (GMT), the time in India will be:
7:00 am (GMT)+5 hours 30 minutes=12:30 pm (IST)7:00 am (GMT)+5 hours 30 minutes=12:30 pm (IST)
So, when it is 7 am at GMT, the time in India (88° East longitude) is 12:30 pm.