Question

What will happen if the international date line passed through greenwich?

Answer 1

Answer:

But if it were on the International Date Line, the roles would swap and what is now the IDL would be the Prime Meridian Line. Crossing the line at Greenwich eastwards would mean setting your watch back a whole day and crossing it westwards would mean setting your watch forwards a whole day.

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Answer 2

Answer:

No, the International Date Line does not pass through Greenwich, England. The International Date Line is only in the Pacific Ocean, on more or less the exact opposite side of the world from Greenwich.

The International Date Line is (more or less) the continuation (or the opposite side) of the Prime Meridian. The Prime Meridian does pass through Greenwich. However, the Date Line is confined to the other side of the world. In other words, the Prime Meridian is at 0 degrees of longitude while (most of) the International Date Line is at 180 degrees.

So, Greenwich is not on the International Date Line. It is on the Prime Meridian Line, i.e. zero degrees longitude. But if it were on the International Date Line, the roles would swap and what is now the IDL would be the Prime Meridian Line.