Rabi' al-Thani
Month
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Rabiʽ al-Thani, Rabiʽ al-Akhir (رَبِيع ٱلْآخِر), or Rabi' II is the fourth month of the Islamic calendar. The name Rabī‘ al-Thani means "the second spring" in Arabic, referring to its position in the pre-Islamic Arabian calendar. Wikipedia
Month number: 4
Number of days: 29-30 (depends on actual observation of the moon's crescent)
Calendar: Islamic calendar