Charles Ellicott Commentary 2 Chronicles 35:17

"And the children of Israel that were present kept the passover at that time, and the feast of unleavened bread seven days." — 2 Chronicles 35:17 (ASV)

CHARACTER OF THE PASSOVER THUS HELD, AND ITS DATE (2 Chronicles 35:17–19).

At that time. —The Passover was kept on the evening of the 14th Nisan, and the Mazzoth from the 15th to the 21st of the same month.