This page shows the timeline in the Halo Universe, it is an open article and additional information might be added in the future with further revelations. The source from which these dates and events are taken are credited to the official halo website and various in-game and novels knowledge.
 August 17th
- Dr. Catherine Elizabeth Halsey discovered John-177 during her survey for expected candidates for the SPARTAN-II project.
 September 23rd
- The SPARTAN-II project started with the conscription of seventy-five children including John-117.
 September 3rd
- The Covenant made its first contact with humans when a Jackal-operated vessel attacked the shipping freighter Horn of Plenty.
 February 11th
- An attempt to make peace between Humans and Covenants goes bad in Harvest which started the Human-Covenant War.
 November 27th
 February 4th
 February 10th
 November 7th
 July 17th
- The Master Chief leads the other SPARTAN-II soldiers and fight against the Covenants in the city of Cote D'Azur and achieved victory with the city being destroyed.
 August 30th
- The Covenants arrive arrived to the human colony, Reach.
 September 7th
- Dr. Halsey locate a Crystal which emits unique radiation.
 September 13th
- The Unyielding Hierophant Covenant space station is attacked by the UNSC's SPARTAN-II soldiers, which delayed its intended invasion of Earth.
 September 19th
- The UNSC Pillar of Autumn (Human Starship) comes near a Forerunner Halo known as Installation 04. The Master Chief, Jacob Keyes and Cortana are abroad the ship.
 October 20th
 October 31th
 November 17th
 March 3rd
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