You get it wrong, like most do, because you don't know how they "counted" days back then.
They counted days like the Judicial system counts days. Here is an example:
A person arrested and put in jail on a Friday night at 11:55pm. He is to spend 3 days in jail.
The person is released Sunday morning at 1:00am, having served his 3 days in jail. It don't matter
what time you go in and what time you leave, the day counts as a day. Even though the person
arrested only spent 5 minutes in jail, on Friday, it counts as his first day. And even though
the person served only one hour on Sunday, that's his third day. The person only
served 25 hours and 5 minutes. But to the judicial system, three days.
Maybe in gentile countries they do this, but biblically and in Israel, you are far from correct. Matt. also proves that, because it specifies, 3 days and 3 nights. Either accept the Word for what it plainly says, or don't.
By your reasoning, the person arrested, should be released on Monday night at 11:55pm.
That is three 24 hour cycles. They aren't counting cycles, but days. This is why so many get
it wrong. They don't know how they counted days then.