Boyd’s Bible Dictionary:
(vine). Twelfth month of Hebrew civil, and sixth of sacred, year, corresponding to parts of September and October (Neh. 6:15).
Strong’s Dictionary of Hebrew Words:
Meaning:
probably of foreign derivation; Elul, the sixth Jewish month
Potts’ Bible Proper Names:
Cry; outcry:―sixth month of Hebrew sacred year, Neh. 6:15. {Vocatio}
From Manners and Customs of the Bible:
Nehemiah 6:15. The twenty and fifth day of the month Elul.
This month corresponded very nearly with September of our calendar.