The starting point for standard time zones is the?

Question

A time meridian.

B prime meridian.

C solar noon.

D International Date Line.

Answer 1

B prime meridian - which is the longitude passing through Greenwich, England = 0 degrees longitude.

The international date line is at 180 degree longitude.

Answer 2

C'mon.  Why don't you look it up on google?  It takes as much time to do that as to ask it here and look like a lazy idiot.