And to make it even harder traditionally the Jewish calendar didn't start until the Harvest of the first fruits and that varies from year to year. But I agree with you that the week Jesus was crucified was a high Sabbath and that gives you three complete days in the grave. A lot of people always say how is Friday to Sunday 3 days but if there was a high Sabbath that week then it's perfectly feasible. Thank you for the thoughtful response! Have a blessed day!