Jewish tradition has the 14th of nisan designated as the beginning of Passover. This is according to the Gospel of John. Thursday is the last day Jesus spent with His diciples and Passover starts Friday. It is on this day that Jesus was crucified and he rose 3 days later. That makes Resurrection Day this Sunday.
Jesus is the Passover lamb. His death corresponds to the exact time the Israelites painted blood from a freshly sacrificed lamb over their doors so the Angel of death didn't hurt anyone inside. The blood sacrifice is to save you. Passover is celebrated as the time the Angel of death passed over the Israelites and God saved them. We don't have the blood sacrifice anymore because Jesus is the Lamb of God and he died and his blood was shed to save us. Jesus is the Passover Lamb.
Traditional Christian teaching doesn't explain this concept but its part of the facts that just all add up. It makes more sense when we see it how God planned it. The true Resurrection Day is this Sunday.
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