If all of time, from the occurrence of Big Bang to the present time, was compressed into a single Earth calendar year... 365 days... each day is about 37.8 million years.
Cosmology
Date Gya (billion years ago) Event
1 Jan 13.8 Big Bang, as seen through cosmic background radiation
14 Jan 13.1 Oldest known Gamma Ray Burst
22 Jan 12.85 First galaxies form
16 Mar 11 Milky Way Galaxy formed
12 May 8.8 Milky Way Galaxy disk formed
2 Sep 4.57 Formation of the Solar System
6 Sep 4.4 Oldest rocks known on Earth
Date in year calculated from formula
T(days) = 365 days * 0.100/13.797 ( 1- T_Gya/13.797 )
Evolution of life on Earth
Date Gya (billion years ago) Event
14 Sep 4.1 First known remains of biotic life (discovered in 4.1 billion-year-old rocks in Western Australia).
21 Sep 3.8 First Life (Prokaryotes)
30 Sep 3.4 Photosynthesis
29 Oct 2.4 Oxygenation of atmosphere
9 Nov 2 Complex cells (Eukaryotes)
5 Dec 0.8 First multicellular life
7 Dec 0.67 Simple animals
14 Dec 0.55 Arthropods (ancestors of insects, arachnids)
17 Dec 0.5 Fish and Proto-amphibians
20 Dec 0.45 Land plants; Ordovician–Silurian extinction events
21 Dec 0.4 Insects and seeds
22 Dec 0.36 Amphibians; Late Devonian extinction
23 Dec 0.3 Reptiles
24 Dec 0.25 Permian–Triassic extinction event; 57% of all biological families and 83% of all genera die
25 Dec 0.23 Dinosaurs
26 Dec 0.2 Mammals; Triassic–Jurassic extinction event
27 Dec 0.15 Birds (avian dinosaurs)
28 Dec 0.13 Flowers
30 Dec, 06:24 0.065 Cretaceous–Paleogene extinction event, non-avian dinosaurs die out
Human evolution
Date / time Mya (million years ago) Event
30 Dec 65 Primates
31 Dec, 06:05 15 Apes
31 Dec, 14:24 12.3 Hominids
31 Dec, 22:24 2.5 Primitive humans and stone tools
31 Dec, 23:44 0.4 Domestication of fire
31 Dec, 23:52 0.2 Anatomically modern humans
31 Dec, 23:55 0.11 Beginning of most recent Glacial Period
31 Dec, 23:58 0.035 Sculpture and painting
31 Dec, 23:59:32 0.012 Agriculture Neolitic
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