OK I am not going to attempt to change your mind. BUT before in Matthew 12 when Christ Himself was letting the high and mighty religious leaders know what was what HE said that the 'sign' was of Jonas... (Jonah) So Christ made Jonah one and the same as the Gospel. And that Christ would be in the tomb the same amount of time as Jonas was in the whale's belly.
We all know that when the women went to check before the sun rose on the first day of the week Christ was NOT in the tomb. So NO part of Sunday day can be 'counted' in the length of time He was in the tomb. AND the 'first' day of the Days of Unleavened Bread is a HIGHT Sabbath. He was killed on Passover Day.
But there is nothing new under the 'sun' as Solomon wrote and people have the free will to believe whatever they choose.
but what we know as “Sunday” started at sundown on Saturday night, so there was plenty of hours he was in the tomb on the first day.
Really? Didn't the Jews at that time count sundown as the beginning of the next day? I'm sure if I'm mistaken about it, someone will correct me. Thanks for that.