What is the mid point of this century?

The exact midpoint is trickier than it might seem. This is the 21st century. It began, 1 Jaunary 2001, and will end 31 December 2100.

Yes, that is correct. We begin counting with the number one, not zero. So the first century was 1 January 1 to 31 December 100 (speaking in terms of counting). Drop the 2 from the front of those years above and you have essentially the same thing.

So, the midpoint of the 21st century will be 1 July 2050.