Most critical scholars date this prophecy in the postexilic period during the time of Ezra and Nehemiah. They base their opinion on the past tense in 3:3, the size of Nineveh according to that verse, and the differences in style between Jonah and Hosea, another northern prophet. Many conservative scholars believe that these arguments do not outweigh the evidence for a pre-exilic date that many features of the book and the traditional Jewish commentaries present.
If the book records events that really happened, the record of them must have come from Jonah himself. However the book nowhere claims that Jonah was its writer. It seems to argue against this possibility by relating the story in the third person rather than in the first. Therefore some unidentified writer appears to have put the book in its final form. The compilers of the Old Testament canon probably placed this book among the minor prophets because they believed that Jonah wrote it.5
One conservative scholar has suggested that what we have is a version of the story that someone wrote for the nation of Judah. He supposedly did this to teach its people the lessons that God earlier taught His prophet, the Ninevites, and the residents of Israel.6Such a message would have been appropriate when the weakened Southern Kingdom faced a threat from another formidable power to its north namely Babylonia. However the arguments for the writer being Jonah are quite convincing.7
The events recorded in the book probably covered only a few months or years at the most. Jonah lived during Jeroboam II's reign (793-753 B.C.). Probably a date of composition somewhere in the neighborhood of 750 B.C. would not be far from the truth.
