Why a new day is starting from the Pacific Ocean and not from Europe?

Why not? It is just a line negotiated in the past, it had to be somewhere.

cause no land body is sitated on this line so that there will not be any conflict of a day in single country in eorope there are so many countries which have irregular border which might be difficult to draw a straight line there which dos not divide ay country in two parts

dunno. ask the people who made the line.