How do we get 72 hours between Friday 6 pm to Sunday 6 am when each part of the day is 12 hours. According to the book of Genesis 1:16-18.

What the Bible says about Three Days and Three Nights

Here on earth, our 24-hour day is composed of two parts, each of 12 hours. Each hour in each part has a corresponding hour in the other part separated by 12 hours: the hour essentially measures the duration since the start of the day part. For example, 1 hour in the first part of the day is equivalent to 13, which is 1 hour into the second part of the day.

Three Days and Three Nights In The Heart of The Earth "For as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth." Matthew 12:40 (BBE).

Now I will give a lot of you a great Big laugh for there's denominations that truly believe that each part ( half) of the 12 hours is a day. This would mean that God's word in Genesis 1:16-18 is a lie , God does not lie , but man does.

Jonah 1:17

What about the sign of Jonah? Was the prophet in the great fish's belly for a complete 72 hours? The marginal note in Bullinger's Companion Bible for Jonah 1:17 reads: "Three days and three nights. The Hebrew idiom 'three days' can be used for parts of three days (and even of years): but not when the word 'nights' is added" (our emphasis). By the addition of "nights," the expression becomes more specific, precluding the idea of "parts" of days!

Matthew 12:38-40.

If Jesus rose from His tomb Sunday morning after being interred Friday evening, we have no Savior! Jesus gave only one sign of His Messiahship: "...so will the Son of Man be three days and three nights in the heart of the earth."

Why did the Pharisees ask Him for a sign? The answer appears in the section immediately preceding their request. Jesus had been preaching that "a tree is known by its fruit" (verse 33), so naturally, these Jews asked for a sign from Jesus to prove He was the Messiah! They wanted to see what fruit He would produce!

Jesus swiftly rebuked them because they had completely missed the point (verses 41-42). To satisfy their curiosity, they wanted to see a miracle, but the fruit Jesus meant was repentance, good works, and spiritual growth. He would make them wait to see the fruits of His ministry.

Thus He says, paraphrasing, "The only sign that will absolutely prove the truth of My message is one that I will have no control over. I will be exactly three days and three nights in the grave. I will be dead. I will not be able to resurrect Myself. So if God the Father resurrects Me after exactly three days and three nights, it will be proved beyond doubt that I am the Messiah."

He gave the same sign in other places to different audiences, each time using similar wording. In John 2:19-21, He says, "'Destroy this temple, and in three days I will raise it up.' . . . But He was speaking of the temple of His body."

To His disciples, He says, "The Son of Man is being delivered into the hands of men, and they will kill Him. And after He is killed, He will rise the third day" (Mark 9:31; 10:33-34; Matthew 17:22-23; 20:18-19; Luke 9:22).

Matthew 16:4.

Jesus Christ had had this conversation before in Matthew 12:40, where He defines His terms: "For as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth."

What does Jesus actually say? If we were listening to Him speak, would we think He meant 72 hours or a period ranging from 36 to 72 hours? Some confuse the issue by arguing from the Jewish tradition supposedly extant during Jesus' day. They claim that if a thing is done at any time during a Jewish day, that day is counted as a whole day. For example, had the fish swallowed Jonah just before sunset, this event of just a few seconds would be counted as occurring over one whole day or 24 hours. Since a day and a night have been counted, only two days and nights remain. By the time Jonah exited the fish, he would have spent only 48 hours there, but the time would be counted as three days and three nights.

Was Jonah in the fish's belly for 72 hours or some time other then 72 hours? The problem with their argument is that they ignore the Timekeeper, God! Notice Jesus' understanding of a day's length in John 11:9: "Are there not twelve hours in each part of the day?" From this we can safely assume that night is also twelve hours long, and day and night together equal 24 hours. It is no stretch of intellect to figure that three days and three nights total 72 hours.

Jesus said He would be in the grave for the same amount of time Jonah was in the fish's belly, a total of 72 hours. In John 2:19, He makes a similar statement in response to the Jews requesting a sign of His messiahship: "Destroy this temple [His body, verse 21], and in three days I will raise it up."

Matthew 27:64.

Commentators say this proves that Jesus did not have to be in the tomb a full three days, but only parts of three days. However, they fail to recognize that the priests spoke this on Thursday, not Wednesday. They were asking Pilate to seal and guard the tomb at least through the Sabbath, when three days and three nights would have fully elapsed since Christ's death and burial!

Mark 15:42-46.

Several points stand out in this passage:

1-Evening was beginning—at best Joseph had only about three hours before sunset, when the Sabbath would begin. The task of preparing and applying the spices for burial required work, which is expressly forbidden on the Sabbath (Exodus 20:8-10). Additionally, Deuteronomy 21:22-23 demands that an executed criminal be buried before nightfall, and the Jewish law of the time required all dead bodies to be buried before a Sabbath or a feast day (John 19:31).

2- Before he could take the body down, Joseph had to go before Pilate and receive permission. At first Pilate did not believe Jesus had died so quickly, so he called the centurion of the crucifixion detail to verify it (Mark 15:44-45). This delay must have taken at least a half hour.

3-After being granted the body, Joseph went to a local shop and bought several yards of fine linen in which to wrap Jesus. With the help of Nicodemus, he then took the body down, wrapped it in the linen—along with about a hundred pounds of spices—and placed it in the tomb (John 19:39-41).

With all this activity and work between the various locations, Joseph and Nicodemus must have had very little daylight left when they finally rolled the stone over the entrance to the tomb. On this point all the accounts again concur; sunset was very near (Matthew 27:57; Luke 23:54; John 19:31).

No one disputes that Jesus was laid "in the heart of the earth" at sunset. If, as we have shown, He was buried for exactly 72 hours, He was also resurrected at sunset—not at dawn!