When the Lord states that “no man knows the day or hour”, could this possibly be a reference to the Feast of Trumpets/ Rosh Hashanah? This day, from my limited understanding, was celebrated by the first full moon which no one knew exactly when that would be. Men would literally be on “look-out” for the full moon. Depending upon what they saw, determined when the Feast was celebrated. Am I reading too much into this, or is it possibly a hint of when the rapture could occur?
You’re right, Rosh Hashanah is the feast where “no man knows the day or hour”, but it’s celebrated on the new moon, not the full moon. Also every time the Lord used that phrase (Matt. 24:36, 42, 50, Matt. 25:13) He was referring to the 2nd Coming, not the rapture of the Church. This is a clue that perhaps the 2nd Coming will be the prophetic fulfillment of Rosh Hashanah, because immediately after the Great Tribulation ends “the Sun will be darkened and the Moon will not give its light” (Matt. 24:29). Therefore no one will be able to calculate the correct date for Rosh Hashanah in advance.
As for the rapture, there’s no particular day set aside for its fulfillment because it’s a number specific event, not a date specific one. In Romans 11:25 Paul indicated that the Church will depart when it’s predetermined number is complete.