Question

with the reference to the international date line state its importance and application

Answer 1

The International date line is the longitude that divides its Eastern and Western side by 24hours. So if we were to cross it from the east to the west we lose a day, and if we cross it from the west to the east then we gain a day.

Answer 2

It is an imaginary longitude that runs through the middle of the Pacific ocean. It divides the northern part and the western part of earth by the time difference of 25 hours.