Question

If you cross the _____, you will either pass into the next day or the previous day, depending on whether you are moving east or west.

Answer 1

International dateline

Answer 2

International Date Line

Step-by-step explanation:

The international date line is an imaginary line. It runs along 180 meridian. It's at equal distance from Prime Meridian in both east and west directions. It marks the zone border where the date changes. If you travel toward the east and cross the dateline you will lose one day, and if you travel towards the west and cross the dateline you would gain one day.