Charles Spurgeon Commentary Zechariah 7:1

"And it came to pass in the fourth year of king Darius, that the word of Jehovah came unto Zechariah in the fourth [day] of the ninth month, even in Chislev." — Zechariah 7:1 (ASV)

God's prophets were not always in the Spirit, and when the Word of God came to them, it was a notable day, and they marked it in their diary. I think that we, too, who are not prophets can remember some special time when God's Word was especially precious to us. We can put down "the fourth day of the ninth month."