Did Jesus Die on Thursday or Friday?

If Jesus died on Friday and arose the next Sunday, what did He mean when He said He would be in the heart of the earth for three days and three nights?

Jesus said, in Matthew 12:40, that as Jonah spent three days and three nights in the belly of a whale, so He would spend three days and three nights in the heart of the earth. If He was crucified on a Friday and raised the following Sunday, how do you explain the this statement?

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