james and lily died on halloween night, 1981. on november 1st, sirius cornered peter which led to his own arrest. he would have been taken into custody and interrogated on the 2nd whilst they awaited the arrival of the dementors to escort him to azkaban.
on november 3rd, sirius spent his 22nd birthday as the first day of twelve years imprisonment, grieving the loss of two best friends, the betrayal of another, and the abandonment of the fourth.
happy birthday, sirius black :)
or, in other words: i want to die