“And the LORD spake unto Moses, saying, Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, an holy convocation. Ye shall do no servile work therein: but ye shall offer an offering made by fire unto the LORD.” (Leviticus 23:23-25)
Days are reckoned from sunset to sunset in scripture. The months begin on the new moon which is the crescent or the first crowning of light following the conjunction (no reflection or light). The first day of the seventh month began at sunset 9/7 and continues thru sunset on 9/8. This begins the New Civil Year for the Jews, but God’s Sacred Calendar begins in the spring on the first new moon closest to the Spring Equinox, which the Annual Holy Days are calculated from. The trumpets feast is the first autumn feast as the first four of God’s feasts are in the spring. The sounding of the trumpets announces the arrival of a King as those (7) in Revelation. The seven trumpets are the seventh seal.
The blowing of the trumpets is a celebration as well as a warning throughout scripture. God’s feasts and annual holy days (sabbaths) represent his great plan for mankind. For more on this day see:
Have a great feast day.