Covenant Battle Calendar

The Covenant Battle Calendar is the standardized timekeeping calendar employed by the Covenant military, intended to assist in chronological coordination between ships, units and planets in different systems with different measures of time. It appears to be the Covenant equivalent of the Military Calendar employed by the UNSC.

The calendar is measured in cycles and then broken down further into units.

Unit
A unit is a Covenant term referring to either a standard unit of measurement, which is comparable to a foot in the human imperial system, or a standard unit of time, comparable to an hour on Earth. The meaning of the term is dependent on the context in which it is used.

Cycle
A cycle is a Covenant unit of time based on the Forerunner temporal unit of the same name. It is equal to a single artificial day on the Covenant's holy city of High Charity. A cycle contains at minimum 265 units.

List of appearances

 * Halo: The Flood
 * Halo: Contact Harvest
 * Halo: Ghosts of Onyx
 * ''Halo: The Cole Protocol
 * Halo: First Strike