Ezekiel 30:20

And it came to pass in the eleventh year, in the first month, in the seventh day of the month, that the word of the Lord came unto me, saying,

Cross-reference

Ezekiel 26:1 has the same year and month (eleventh, first) but different day — a close chronological marker in Ezekiel's prophecies.

Ezekiel 31:1 dates to the same year (eleventh) but different month (third vs first) — moderate chronological link.