Shahrivar (Persian: شهریور, Persian pronunciation: [ʃæhɾiːˈvæɾ]) is the sixth month of the Solar Hijri calendar, the official calendar of Iran and Afghanistan. Shahrivar has thirty-one days. It begins in August and ends in September by the Gregorian calendar. The Afghan Persian name is Sonbola; in Pashto it is Waǵay. Shahrivar is the third and final month of summer. It is followed by Mehr. The name of the month comes from the Zoroastrian deity Kshatra Vairya.