Dhuʻl-Qiʻdah
Month
Dhu al-Qa'dah, also spelled Dhu al-Qi'dah or Zu al-Qa'dah, is the eleventh month in the Islamic calendar.
It could possibly mean "possessor or owner of the sitting and seating place" - the space occupied while sitting or the manner of the sitting,... Wikipedia
Month number: 11
Number of days: 29-30 (depends on actual observation of the moon's crescent)
Calendar: Islamic calendar
Significant days: Battle of the Trench; Treaty of Hudaybiyyah