In the summer there occurs a three week period of mourning that begins with the Fast of Tammuz and ends with Tishah B’Av. The last nine days of this three week period (i.e., from Av 1 until Av 9th) are days of increased mourning. However, after this somber time, the happier holiday of Tu B’Av, the 15th of Av occurs. Summer ends with the 30 days of the month of Elul, a yearly season of teshuvah (repentance) that anticipates Rosh Hashanah and the fall holidays. The 30 days of Elul are combined with the first 10 days of the month of Tishri to create the “Forty Days of Teshuvah” that culminate with Yom Kippur.
Because they occur between the spring and fall holidays, the summer holidays help us prepare for the second coming of the Messiah:
Note that in accordance with tradition, holiday dates begin at sundown. Moreover, some holidays may be postponed one day if they happen to fall on the weekly Sabbath:
For more information see the Hebrew for Christians Holiday Pages…