that’s the whole point, there aren’t “days” and “nights”.
in the Scriptures, any part of a day or night is counted as a whole day.
a baby born one minute before sunset and dies one minute after sunset, lived for two minutes, but according to the SCRIPTURES, was alive two days.
your scenario conveniently ignores the “day” of the 14th of aviv, which is required or else you would have 4 days and 3 nights in the heart of the earth.
misinterpreting Matthew 12:40 causes all kinds of problems, doesn’t it?
Yes it does! But that doesn't seem to deter you...
Matt. 12:40 For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth.
You swallow the elephant of an entire missing night but choke on the proverbial gnat of a few minutes either side of dusk - not to mention it's very likely the stone was rolled into place, for the last time, exactly at dusk!
And if that were the case, which it very well could have been, then your entire basis of an extra day (4 days vs. 3 days) also vanishes - though we're only talking minutes regardless if that was the case or not.