The Allegory of the Cauldron.
‘Again in the ninth year, in the tenth month, on the tenth day of the month, the word of Yahweh came to me saying, “Son of man, write down yourself the name of the day, even of this selfsame day. The king of Babylon drew close to Jerusalem this selfsame day.” '
This day was a momentous day, and Ezekiel was told to write it down so that it would be remembered. It was the day when the forces of Nebuchadnezzar appeared before Jerusalem and the long siege was began that would end in its destruction (Ezekiel 33:21). It was in January 588 BC, in the ninth year of Jehoiachin's captivity. Compare for this 2 Kings 25:1; Jeremiah 52:4.
Some cavil at the idea that Ezekiel could have this so clearly revealed to him when he was so far away, but such telepathic communication is well testified to elsewhere, and Ezekiel was particularly receptive to such revelations from God. When my uncle was in the trenches during the first world war my aunt (not his wife, he was only seventeen) woke the family, my mother among them, to say, ‘Jimmy's dead'. And the telegram arrived shortly afterwards to say that he had been blown up that very night. Something within her had told her the tragic fact. And similar incidents have certainly been repeated again and again. How much more then could such a man, full of the Spirit of God, be aware of events happening far away.
When he informed those who came to hear him there would certainly be some doubt, but eventually messengers would arrive who would confirm the grim news. Then they knew that this man indeed spoke from God.