THROUGHOUT the country. It is the actual time of Mirzapur.Mirzapur has the time along the Standard Meridian of India which is 82° 30' E.Hence, it is taken as the standard time for the whole country. The Indian Standard Time (IST) is 5 hours 30 minutes ahead of the Greenwich Mean Time (GMT)..Local Time (L) and Time Zones:The earth is DIVIDED into 24 longitudinal zones, each being 15 degrees or 1 hour apart in time (360 degrees = 24 hours, 360/24=15 degree in 1 hour) or 1 degree in 4 minutes is called Standard Time Zones.Russia has as many as 11 time zones.Both the USA and Canada have FIVE time zones.Longitudes are measured from zero to 18° east and 180° west (or 180°) and both 180° longitudes share the same line, in the middle of the Pacific Ocean.International Date Line (IDL)The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the south pole and demarcates one calendar day from the next.It passes through the middle of the Pacific Ocean, roughly following the 180° longitude but it deviates at Aleutian Islands, Fiji, SAMOA, and the Gilbert Islands.The International Dateline is on the opposite SIDE of the Earth-Prime Meridian.The Prime Meridian helps to define Universal Time and is the meridian from which all other time zones are calculated.