Gal 4:9 But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?
Gal 4:10 Ye observe days, and months, and times, and years.
Gal 4:11 I am afraid of you, lest I have bestowed upon you labour in vain.
In Jewish thought, (I am a Messianic Jew by the way) any part of any day is counted as a day. A Wed crucifixtion would make HIS rising on Fri. Thurs. would make it Sat. Only on Fri. would it be a Sunday resurrection!
Who really cares, simply worship HIM!