At evening into Feast of Unleavened Bread Day 1. April 15 thru April 21 (at evening, April 14 until evening, April 20) April 15 (at evening, April 14, a righteous convocation) April 21 (at evening, April 20, a righteous convocation)April (Abib) 15th. A righteous gathering. (Exo 12:15-20)