On the cosmic calendar, about when did Earth form?

January 1 big bang. FEBRUARY 11, 2016 BY THREEPOINTEIGHTBILLIONYEARS.COM

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On his calendar (dates here are from the Wikipedia version), takes place on January 1, the Milky Way takes shape around March 11, our Sun appears on September 2 with its planets soon after. Life begins on September 21. All of October is blank because there were no outstanding organic firsts, just the persistence of simple bacteria and their cousin

Decmeber 31 .. 13.82 billion years. age of universe. 9.2 years after big bang Sun and planets form. picture 3 blogspot.co