If the entire history timeline of the universe was compressed to a single calendar year, modern humans would appear on December 31st at about 11:59pm.
Consider the Big Bang happened on January 1st midnight, then :
First atoms were formed an hour later at, 1 AM
Sun was born on September 1
Earth was born on September 11
Dinosaurs appeared on December 27 and became extinct on December 30
Yes, last day of the year and still humans didn`t appear on earth.
So, first humans/homo sapiens arise on December 31st, 11.39 PM
First man walks on Moon on December 31st, 18.104.22.168 PM
And we close the calendar with Present day being next January 1st, midnight