What is the international date line

What is the international date line

The international date line Ï nternational Date Line (DL Ï) is an imaginary line on the Earth's surface from which starts today and ends, passing _ almost _ on longitude 180 with the unevenness of the left or right to avoid inhabited islands as possible,

And international date line roughly Pacific fair Pacific cean Ô into Eastern and western halves (see attached map), and every traveler crosses this line East or West modification date and day.