whirlingmere,
I don't see where your post #5 shows examples where a daytime or a night time was said to be involved with an event when no part of a daytime or no part of a night time could have occurred.
There are many examples were a claimed after N days and on the Nth day mean the same thing. It's not a math issue, it's a language usage issue. Language usage can be approximate and may not be meant in a wooden literal sense.
(from Christian think tank )
Gen 42.16:
"And he put them all in custody for three days. 18 On the third day, Joseph said to them, "Do this and you will live, for I fear God" and they are released ON that day (from the context of verses 25-26). In this case the 'for three days' meant only 'into the third day'
1 Kings 20.29:
"For seven days they camped opposite each other, and on the seventh day the battle was joined. " In this case we have 'for seven days' meant only 'into the seventh day'.
2 Chr 10.5:
"And he said to them, 'Return to me again in three days" (NAS) with verse 12: "So Jeroboam and all the people came to Rehoboam on the third dayas the king had directed, saying, 'Return to me on the third day." In this case 'in three days' is equivalent to 'on the third day'.
Esther 4.16:
"Go, gather together all the Jews who are in Susa, and fast for me. Do not eat or drink for three days, night or day. I and my maids will fast as you do. When this is done, I will go to the king, even though it is against the law. And if I perish, I perish.'" And then in 5.1:
"On the third day Esther put on her royal robes and stood in the inner court of the palace, in front of the king's hall. " In this case, "on the third day" is equivalent to "for three days, night or day".
1 Samuel 30.12:
"He ate and was revived, for he had not eaten any food or drunk any water for three days and three nights. 13 David asked him, "To whom do you belong, and where do you come from?" He said, "I am an Egyptian, the slave of an Amalekite. My master abandoned me when I became ill three days ago. "In this case "for three days and three nights' somehow was fulfilled when his master left him 'three days ago'.