D defs.my
Entry 1 sense Webster, 1913

Date line

· IPA
01 The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same d…
  1. 1.
    The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same day shall have a different name and date in the calendar from its name and date on the other side. Also called International Date Line. Also: International Date Line