2 Kings tells about Jehoiachin, one of the last kings of Judah. It says Nebuchadnezzar king of Babylon besieged Jerusalem until Jehoiachin surrendered. Then Nebuchadnezzar took him to Babylon as a prisoner, and made Jehoiachin’s uncle king of Judah instead.
37 years later, Nebuchadnezzar’s son Awel-Marduk became king of Babylon, and he was nicer to Jehoiachin. He released Jehoiachin from prison on the 27th day of the 12th month.
The book of Jeremiah tells the same story about Awel-Marduk and Jehoiachin… except it says he released him on the 25th day of the 12th month.