Every Easter the usual suspects post their unfounded attacks on our traditional understanding of Easter, which is Christ was crucified on Friday and was laid in the tomb before Saturday began at around sundown of Friday. Christ spent part of Friday, all of Saturday and arose just at daylight on Sunday, which using inclusive counting is three days, and is consistent with the Hebrew idiom of "3 days and 3 nights."
The answer to Matthew 12:40 (three days and three nights) is to accept that Jesus was using a colloquialism, three days and three nights only referring to three days or part days rather than 72 literal hours. In 1 Samuel 30, verse 12, the account of a starving servant is recorded as follows: “…For he had not eaten bread or drunk water for three days and three nights.” But in verse thirteen, his problem had started three days ago. This passage therefore suggests, and I accept that “three days and three nights” is a figurative reference to three days or parts of days and not to a literal 72 hours or a literal three daylight periods and three darkness periods because three days ago would only include two darkness periods. If you compare 2 Chronicles 10:5 (return to me in three days) with 2 Chronicles 10:12 (came to Rehoboam on the third day) you will see that three days and on the third day mean the same thing, indicating that both inclusive counting was used and parts of days were counted as days in the pre-scientific culture. Inclusive counting means that you count today as the first day when saying something happened three or any number of days ago or in the future. Therefore, “three days and three nights” is a figurative reference to three days ago, and three days ago is the day before yesterday or literally only two nights ago. The point of Matthew 12:40 was not to create conflict with the many scriptures that say “on the third day” but only to draw a parallel with Jonah by using the terminology of Jonah 1:17.
The answer to Matthew 12:40 (three days and three nights) is to accept that Jesus was using a colloquialism, three days and three nights only referring to three days or part days rather than 72 literal hours. In 1 Samuel 30, verse 12, the account of a starving servant is recorded as follows: “…For he had not eaten bread or drunk water for three days and three nights.” But in verse thirteen, his problem had started three days ago. This passage therefore suggests, and I accept that “three days and three nights” is a figurative reference to three days or parts of days and not to a literal 72 hours or a literal three daylight periods and three darkness periods because three days ago would only include two darkness periods. If you compare 2 Chronicles 10:5 (return to me in three days) with 2 Chronicles 10:12 (came to Rehoboam on the third day) you will see that three days and on the third day mean the same thing, indicating that both inclusive counting was used and parts of days were counted as days in the pre-scientific culture. Inclusive counting means that you count today as the first day when saying something happened three or any number of days ago or in the future. Therefore, “three days and three nights” is a figurative reference to three days ago, and three days ago is the day before yesterday or literally only two nights ago. The point of Matthew 12:40 was not to create conflict with the many scriptures that say “on the third day” but only to draw a parallel with Jonah by using the terminology of Jonah 1:17.