Note 539 — Chapter XXXIX · BATTLE OF SIFFIN. A.H. XXXVI., XXXVII. A.D. 657.
Reading edition
Some make the interval arranged for to have been eight months. The ordinary term named by tradition is to Ramadhân or February (A.D. 658), which was seven or eight months from the date of the truce; others name Shabân, or January, making the interval six; and this is the commonly received account.