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.
The DT (DaTe) line shows when an entry first appeared in the the database and when it was last updated.
The DT (DaTe) lines show the date of creation and last modification of the database entry.