I got the 4.543 Billion off of Google. They don't have a clock going back to the exact time.

They believe in Julius Caesar as the true ruler of the ancient world?

Dude, that was B.C., it's 2015 A.D., and atheists are just trying to not be confusing....

If you didn't know, atheists and some religious people like to go by B.C.E (Before the Common Era) Which goes pretty much exactly until your A.D. and the athiest's C.E. (Common Era) starts. If you're curious how it can be that exact, both Christians and Atheists use a civil calendar with the same historic origins. However, if you don't know about B.C and B.C.E. and believe that God created humans and Philosoraptors to frolic together in the fields in 0 A.D/C.E., I'm sorry for your loss in brain cells.

thats bullcrap, that makes no sense at all

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bbbbbrrrrruuuuu! thats infinite IQ

Because most atheists aren't dumb and realize that since people use the AD calendar they might as well so that there aren't problems.