Daniel the prophet said:
And from the time that the daily sacrifice shall be taken away, and the abomination that maketh desolate set up, there shall be a thousand two hundred and ninety days. Blessed is he that waiteth, and cometh to the thousand three hundred and five and thirty days (Dan 12:11,12).
For two thousand years, the period of 1335 days remained a mystery. Why 1335? Does it mean anything?
Recently Ken Jonson (the scholar researching the Dead Sea scrolls) find out the 1335 idiom in the Dead Sea scrolls. It relates to the coming of the Shavuot feast (Pentecost) - the feast when through all history the Covenants been made between God and man.
According to Daniel, the 1335-day span is the 2nd half of the Tribulation. According to the Dead Sea scrolls, it is the span between Jewish Sukhot and Shavuot three and a half years later.
That means that the middle of the Tribulation period falls on the Sukhot feast and that the Tribulation will begin some year on Passover.