Indian Standard Times is ahead of Greenwich mean time by __________.

The correct answer is 5 1/2 hours.

Key Points

• The Indian Standard Time (IST):
  • The Indian Standard Time is calculated from 82°30’E meridian passing through Mirzapur.
  • IST is plus 5.30 hours from the GMT.
  • It does not take into account daylight saving time along with other seasonal factors.
  • India has only one-time zone.
• Greenwich Mean Time (GMT): 
  • Greenwich Mean Time (GMT), the name for the mean solar time of the longitude (0°) of the Royal Greenwich Observatory in England.
  • The meridian at this longitude is called the prime meridian or Greenwich meridian.