Q: WHEN WAS THE FIRST SIEGE OF JERUSALEM?
A: IT DEPENDS WHAT CALENDAR YOU ARE USING!
On the Gregorian calendar (the one you might have on your wall) the year was 542 BC.
On the Hebrew calendar, sometimes called the biblical calendar, the year was 3505 AM.
2 Kings 24:1 New King James Version (NKJV)
Judah Overrun by Enemies
24 In his days Nebuchadnezzar king of Babylon came up, and Jehoiakim became his vassal for three years. Then he turned and rebelled against him.