According to, Jeconiah was released from prison "on the 27th day of the twelfth month": this indicates the first year of captivity to be 598/597 BC, according to Judah's Tishri-based calendar.
According to, Jeconiah was released from prison "in the 37th year of the exile", in the year that Amel-Marduk (Evil-Merodach) came to the throne. This indicates the first year of captivity to be 598/597 BC, according to Judah's Tishri-based calendar.