Sontaran martial year
From Tardis Wiki, the free Doctor Who reference
The Sontaran martial year was a unit of time alternative to the Earth year, used by the Sontarans. In the Sontaran martial year 5709, the Fifth Doctor interfered in the Sontaran's conflict with the Rutans on Samur. (AUDIO: Heroes of Sontar)
It is unclear how the Sontaran calendar relates to the human Anno Domini calendar.
