In the fourth year of King Darius, the word of the Lord came to Zechariah on the fourth day of the ninth month, which is Chislev.
References for Zechariah 7:1
Now [the people of] Bethel had sent Sharezer, Regem-melech, and their men to plead for the Lord's favor
References for Zechariah 7:2
by asking the priests who were at the house of the Lord of Hosts as well as the prophets, "Should we mourn and fast in the fifth month as we have done these many years?"