According to the bible Jesus resurrected at the first day of the week. Nowadays we would call that day Sunday. But the first day of the week is based on the Hebrew calendar. In those days the Jews were colonized by the Roman empire and they used the Julian calendar. The week of the Romans in those days had 8 days and were called from A till H. I don't know what their 'holy day' was or their rest day.
But is it possible in some way to find out how the Hebrew weekdays in the time of Jesus' resurrection correspond with the Roman days?