Strange things happen to time when you travel,because the earth is divided into twenty four time zones,one hour apart.You can have days with more than twenty-four hours,and weeks with more or fewer than seven days.
If you make a five-day trip across the Atlantic ocean,your ship enters a different time zone every day.As you enter each zone,the time changes one hour Traveling west. you set your clock back:traveling east, you set it ahead.Each day of your trip has either twenty-five of twenty-three hours.
If you travel by ship across the Pacific,you cross the international date line.By agreement, this is the point where a new day begins.When you cross the line,you change your calendar one full day,backward or forward.Traveling east,today becomes yesterday,traveling west,it is tomorrow!