Leviticus 23:4-8
4 ‘These are the feasts of the LORD, holy convocations (holy rehearsals) which you shall proclaim at their appointed times.
5 On the fourteenth day of the first month at twilight is the LORD’s Passover.
6 And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; seven days you must eat unleavened bread.
7 On the first day you shall have a holy convocation; you shall do no customary work on it.
8 But you shall offer an offering made by fire to the LORD for seven days. The seventh day shall be a holy convocation; you shall do no customary work on it.’

1 Corinthians 5:7 
Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us.

The year of Jesus' death was widely accepted as 30 AD with the below facts:

• The date of His birth from many sources agreed that Jesus was born between 4 to 2 BC.

• Jesus was about 30 years old when He began His ministry (Luke 3:23).

• The length of Jesus' ministry is widely accepted as 3 years.

• 40 years later in 70 AD, the Second Temple was destroyed by the Roman Empire.

Taking His death as 30 AD, I went to generate a Jewish Calendar @ http://www.hebcal.com/ and obtained the calendar for April 30 AD or Nisan-Iyyar for Jewish Year 3790.

Note that in 30 AD, Nisan 14 was from the evening of Tuesday to the evening of Wednesday (about 6 pm to 6 pm).

As the First Passover in Egypt was a holy rehearsal of Jesus, our Passover, let's take a look at the amazing alignments in both OT and NT as shown in the pdf chart @ Passover Alignment.