A person traveling westward across the International Date Line gains a day.

Question

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The International Date Line is an imaginary line located roughly along the 180 degrees longitude, and it marks the place where one day ends and the next begins. When a person travels westward across the IDL, they move the clock back 24 hours, which means they gain a day. For example, if it is Monday in Japan, and a person travels to the United States across the IDL, they will experience Tuesday twice, effectively gaining a day. Conversely, a person traveling eastward across the IDL would lose a day.

A Person Traveling Westward Across the International Date Line Gains