Answer :
Final answer:
When traveling east across the International Date Line, you subtract a day from your calendar. This is done to compensate for the advancement of time as you move eastward.
Explanation:
The International Date Line is an important concept in geography. When you cross the International Date Line from west to east (i.e., traveling eastward), by convention, you would subtract a day from your calendar. This is to compensate for the time advancement that is occurring as you move eastwards. On the contrary, when crossing from east to west, you would increase the date by one day. This system allows for a rational method of timekeeping on our planet as the date can differ in different cities at the same time. For example, when the Imperial Japanese Navy bombed Pearl Harbor in Hawaii, it was Sunday, December 7, 1941, in the United States, but in Japan, it was already Monday, December 8.
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