ABST

Definition

 * ABST stands for "After the Birth of Spartan Todd" and is used for the viewer to keep track of the Clans of Halo timeline; it is also referred to as the second half of the Clans of Halo Calendar. This form of chronological timekeeping is not used by the in-universe characters.

Important Known Years

 * 0 ABST
 * 2 ABST
 * 10 ABST
 * 15 ABST