Not "MY" organization...THE CHURCH. In the Orthodox Church, we celebrate Easter or Pascha according to the Julian Calendar, subject to the day passover falls on.
Now brace yourself......Jesus and all of the Apostles used the Hebrew calendar......including the Apostle John who personally taught Polycarp.
Jesus spent 72 hours(three days)in the grave according to scripture. Do the orthodox show three full days from burial to resurrection?