The Passover is a Lamb, not a day. Please disregard the time of day. That's not Biblical. The 9th hour is when He died (3PM), not when He was crucified. He was hung on he cross on the 3rd hour (9AM). Exodus 12:18 is easier to understand when we are able to comprehend that "evening" represents the beginning of the following day.
Yes excuse me I meant died at 3pm, yes he was crucified at 9am and the notice placed above the cross at the 6th hour.