What is meant by using international Date line?« Back to Questions List


The international Date Line (IDL) is an imaginary line on the skin of the Earth.  It used to be established via the global Meridian convention of 1884. the road  runs from the north to the south pole and demarcates one calendar day from the following. It passes through the heart of the Pacific Ocean.



The international Date Line round a hundred and eighty°


The earth is split into 24 one –hour zones. These 24 zones collectively make one full day. each hour is 15 degrees longitude. for the reason that earth rotates eastward, the time on  clock progresses westward round the sector. London is 0 level longitude and Washington DC is 75 degrees west of London. So when 12 o’clock midday occurs in London five hours in advance of  Washington DC.

 The earth is divided vertically  into 360 longitudes. Zero stage longitude passes through Greenwich and a hundred and eighty level longitude is referred to as global Date Line. On either facet of IDL, the time is similar, however there is a distinction of 24 hours. A vacationer crossing the IDL eastbound subtracts sooner or later, or 24 hours, in order that the calendar date to the west of the road is repeated after the next middle of the night. Crossing the IDL westbound ends up in 24 hours being added, advancing the calendar date by sooner or later. The IDL is important to have a set, albeit arbitrary, boundary on the globe the place the calendar date advances in the westbound route.

The IDL is on the opposite aspect of the Earth to the high Meridian. The top Meridian is used to define common Time and is the meridian from which all other time zones are calculated. Time zones to the east of the prime Meridian are upfront of UTC (up to UTC+14); time zones to the west  shifting level of nighttime separate the 2 calendar days which can be current someplace on this planet.