Your birthday in the universe

Enter your birth date to see how many days old you are, how old you would be on Mars or Jupiter, what the Moon looked like on your birthday and which empires existed then. Everything is calculated in your browser only.

05Cosmic Calendar

Imagine the entire history of the universe (13.8 billion years) squeezed into a single year: the Big Bang happens on 1 January at 00:00, and today is New Year's Eve at midnight.

  • Big BangJanuary 1

    13,800,000,000 years ago

  • The first stars igniteJanuary 6

    13,600,000,000 years ago

  • Sun and Earth formSeptember 2

    4,570,000,000 years ago

  • First traces of lifeSeptember 22

    3,800,000,000 years ago

  • Oxygen builds up in the airOctober 29

    2,400,000,000 years ago

  • Cells with a nucleusNovember 14

    1,800,000,000 years ago

  • First multicellular animalsDecember 16

    600,000,000 years ago

  • Cambrian explosionDecember 17

    539,000,000 years ago

  • Dinosaurs appearDecember 25

    230,000,000 years ago

  • Dinosaurs go extinctDecember 30

    66,000,000 years ago

  • First humans of the genus HomoDecember 31, 22:13:21

    2,800,000 years ago

  • Modern humans (Homo sapiens)December 31, 23:48:34

    300,000 years ago

  • Farming beginsDecember 31, 23:59:32.5

    12,000 years ago

  • First writingDecember 31, 23:59:48.1

    5,200 years ago

  • Pyramids of GizaDecember 31, 23:59:49.4

    4,600 years ago

  • Start of the common eraDecember 31, 23:59:55.4

    2,000 years ago

  • Gutenberg's printing pressDecember 31, 23:59:58.6

    575 years ago

  • First Moon landingDecember 31, 23:59:59.8

    57 years ago

  • TodayDecember 31, 24:00

A human life of 80 years lasts only 0.18 seconds in this calendar.

Dates are rounded approximations based on current research.

Frequently asked questions

How old am I on Mars?

Divide the days you have lived by 687, the length of a Martian year in Earth days. At 30 years old you would be about 16 on Mars.

How many days old am I?

Multiply your years by 365.25 and add the days since your last birthday. At 30 years that is about 10,958 days; this page calculates it for your exact date.

Is my birth date stored?

No. The calculation runs only in your browser; nothing is sent or saved.