Zechariah 7:1

And it came to pass in the fourth year of king Darius, that the word of the Lord came unto Zechariah in the fourth day of the ninth month, even in Chisleu;

Cross-reference

In Zechariah 1:1, a similar date formula introduces an earlier prophecy, showing chronological progression in Zechariah's ministry.

Zechariah 6:9 uses the same 'word of the LORD came' formula, marking another oracle in the same book.

Ezra 6:15 gives the temple completion date in Darius's reign, anchoring the chronological setting of Zechariah's prophecy.

Haggai 2:10 dates an earlier prophecy under Darius, showing Zechariah's ministry overlapped with Haggai's.