What time is, is a great mystery of Physics, although we all have a good (maybe) intuition of what this is.

This is the time now: http://time.is

And this is the time in the rest of the World.

This is time in recent and contemporary history:

Leonard Eisenberg at http://evogeneao.com made this nice diagram of how evolution spreads through time on earth (click to zoom):


Nodes of interest