Until properly understood early explorers who crossed this line found that when they came into port their ship log said one day and the people on land said another.
Going right of the Date Line the day is ahead of the left side. Tonga, therefore, is 24 hours ahead of Samoa. When I fly from Los Angeles to Nepal, I am gaining time in accordance with this imaginary line and when I fly back I will lose time. Very confusing of course.
