the International Date Line
noun [ S ] uk/ɪn.təˌnæʃ.ən.əl ˈdeɪt laɪn/ us/ɪn.t̬ɚˌnæʃ.ən.əl ˈdeɪt laɪn/
国际日期变更线
The International Date Line is an imaginary line between the most northern and southern points on earth that goes through the Pacific Ocean. The date on the west side of the line is one day earlier than the date on the east side of the line.