Is the International Date Line the same thing as the prime meredian?

The prime Meridian is 0 degrees longitude, and passes through Greenwich England, which is why UTI used to be galled Greenwich Mean Time. It is an artifact of Britain’s former command of the sea. It is not the Date Line.

No, they are not. This is the International Date Line and this is the Prime Meridian. They are 180 degree apart.

@dpworkin And it was indeed “galling” to the rest of the world.

Only concurring with what’s already been said. The International Date Line is on the opposite side of the globe from the Prime Meridian. So the two are twelve hours apart.

I thought it was like a 900 number with operators from around the world…

Wasn’t Meridian Prime a planet on Star Trek?

The International Date Line isn’t even a meridian. It zigzags through the Pacific so as to keep some islands, e.g., the Aleutians, on a coherent calendar.