The International Date Line is an imaginary line located in the Pacific Ocean that separates two consecutive calendar days. It runs from the North Pole to the South Pole and passes through the middle of the Pacific Ocean. If you cross the dateline from west to east, you lose a day, and if you cross it from east to west, you gain a day. Some of the countries that are located on or near the International Date Line include Fiji, Samoa, Tonga, and New Zealand.