Question

while travelling in which direction if cross a IDL we need to consider a next day and date​

Answer 1

Explanation:

The International Date Line (IDL) is an imaginary — and arbitrary — line on Earth's surface that runs from the North Pole to the South Pole. When you cross the IDL, the day and date change. If you cross it traveling westward, the day goes forward by one, and the date increases by one.