The original Easter morning occurred on the first day of the Jews' week. (Matt 28:1, Mark 16:1-2, and John 20:1)
However, the first day of the Jews' week isn't the anchor for Jesus' resurrection. The real anchor is whatever night of the week that the paschal lamb is eaten, and the date for that night floats on the civil calendar, i.e. it isn't fixed like Christmas and birthdays.
The paschal dinner is always eaten at night; viz: after the sun goes down-- all the way down. 2020's night for the dinner will commence at sundown the afternoon of Wednesday April 08, which means that Jesus would die on the cross the afternoon of that same day because his death occurred during the afternoon of the day that the Jews were preparing for their paschal lamb dinner. (John 18:28, John 19:14)
The three nights that Jesus predicted in Matt 12:40 are counted by beginning with the night of the paschal dinner. Seeing as that night is scheduled to begin in 2020 with sundown the afternoon of Wednesday April 08, then Wednesday night would be the first night; Thursday night the second night, and Friday night the third night.
The three days are counted by beginning with the sunrise that wraps Passover night, which in 2020 is Thursday April 09; so then that day would be the first day, Friday the second day, and Saturday the third day, viz: Jesus' resurrection, were it to take place in 2020, would commence Saturday morning April 11.