AvAv Av Av (; from Akkadian "ʾAbū" "father") is the eleventh month of the civil year and the fifth month of the ecclesiastical year on the Hebrew calendar. The name comes from Araḫ Abu, "month of Abu", from the Babylonian calendar. The name "Ab" () also appears in the Arabic language for the month of August in the Levant (see Arabic names of calendar months).The name first appears in Second Temple literature, such as Megillat Taanit. It is one of several months which are not explicitly named in the Hebrew Bible (Tanakh). It is a month of 30 days. "Av" usually occurs in  July–August on the Gregorian calendar. The Babylonian Talmud, Taanit 29a, states that "when we enter [the month of] "Av", our joy is diminished". This is because the darkest events in Jewish history occurred during the first week and a half of this month, particularly the Nine Days which culminate in "Tisha B'Av", the 9th of "Av". However, there is a minor and largely unknown holiday during the full moon of the month called "Tu B'Av" which was, in ancient times, one of the happiest days of the year. The month is also sometimes referred to as Menachem Av () ("Av  of Comfort" or "Comforter of Father(s)"), but most only use this title in the sanctification of the month recited on the Shabbat before Rosh Chodesh and following "Tisha B'Av". Av Av (; from Akkadian "ʾAbū" "father") is the eleventh month of the civil year and the fifth month of the ecclesiastical year on the Hebrew calendar. The name comes from Araḫ Abu, "month of Abu", from the Babylonian calendar. The name "Ab" () also appears in the Arabic language for the month of August in the Levant (see Arabic names of calendar months).The name first appears in Second Temple literature, such as