ATS 2.3:1297 :halin hamša iumia ḏparuanaiia ḏbminian iumia lamitminin ubhušbania ḏiumia lamithišbin : these five intercalary days that are not counted in the count of days and not reckoned in the reckoning of days
See the entire entry for ḥušbān, ḥušbānā n.m. calculation