The fourth year of Ring Darius - Two years after they began to rebuild the temple, see Zechariah 1:1, A.M. 3486.
The ninth month, even in Chisleu - This answers to a part of our November and December. The names of the month appear only under and after the captivity.
In the fourth year of Darius - Two years after the series of visions, shown to him, and two years before the completion of the temple. Chisleu being December, it was the end of 518 b.c.