Is the international dateline the primemeridian?

Answer 1

The Prime Meridian and its opposite the 180th meridian (at 180° longitude), which the International Date Line generally follows, form a great circle that divides the Earth into the Eastern and Western Hemispheres.

Answer 2

No, the International Date Line and the Prime Meridian are not the same. The Prime Meridian, at 0 degrees longitude, serves as the starting point for measuring longitude. In contrast, the International Date Line, located at approximately 180 degrees longitude, marks the change in calendar date as one travels east or west across it.