The Minor Prophets (in alphabetical order) are Amos, Habakkuk, Haggai, Hosea, Joel, Jonah, Malachi, Micah, Nahum, Obadiah, Zechariah, and Zephaniah.
The books of these prophets are considered "minor" since each is much shorter than the writings of "major" prophets Isaiah (sixty-six chapters), Jeremiah (fifty-two chapters), and Ezekiel (forty-eight chapters).
The longest Minor Prophet books are Hosea and Zechariah, with each having fourteen (14) chapters. The shortest prophetic book in this series is Obadiah, with only one chapter, followed by Haggai, which has only two.
The Book of Daniel, although it contains important prophecies from Daniel’s time to the end of the age and Christ’s return, is not included as part of the writings of the Minor Prophets. This is because Daniel wrote in Babylon during the Jews' 70-year exile.
Please note that in the below timeline that all dates are B.C. The text underneath each prophet is a brief description of the themes of their prophecies and to whom they are addressed or affect.
Jonah
798 B.C.
Jonah, the first of the Minor Prophets to have written, is a type of Jesus Christ and shows God's mercy to repentant. He wrote his prophecies against Nineveh, with implications to all people. He spoke of the cruelty of the Assyrians.
Hosea
c. 792 to 715
Hosea wrote about salvation and his prophecies were against Israel (Ten Tribes of Israel). He condemned adultery, drunkenness, idolatry and licentiousness.
Amos
c. 762 B.C.
Amos wrote about the prophetic Day of the Lord. His predictions were against Israel, Judah, Benjamin and all nations. He spoke about the oppression of the poor, sexual immorality, wanton luxury and corrupt laws.
Micah
740 to 711
Micah wrote about how the Eternal is a just Judge. His prophetic words were against Samaria, Jerusalem and all nations. He condemned the lack of justice and oppression of the people.
Nahum
711
Nahum wrote about the judgment on Nineveh and the subsequent comfort to Israel. His prophecies were against the Assyrians (primarily Nineveh). He condemned the cruelty of Assyrians and their overstepping of boundaries.
Zephaniah
c. 640 - 609
Zephaniah, the tenth Minor Prophet, wrote concerned God's indignation, Israel's repentance and their subsequent saving by the Lord. His inspired prophecies were against Judah and all people. He warned of spiritual fornication and the events with the Day of the Lord.
Habakkuk
626
Habakkuk wrote about how God embraces Judah through destroying the Chaldeans. His prophetic utterings were against Babylon with implications for all people. He cried out against aggression, plunder, greed, graft, idolatry and inhumanity.
Joel
596 to 586
Joel's book mostly concerns the prophetic Day of the Lord. His words were against Israel and all people in general. He condemened adultery, drunkenness, idolatry and licentiousness.
Obadiah
590
Obadiah spoke about the Day of the Lord, Edom's destruction and Israel's restoration as a people.
Haggai
520
Haggai wrote about how the restoration Temple points to the Church. His words also centered on Zerubbabel, Joshua and the returning remnant of God's people. He condemned the neglect in building God's House.
Zechariah
520 to 518
Zechariah was inspired to record that the coming of God's Kingdom will be preceded by the building of the Temple. His prophecies concerned Zerubbabel and Joshua the High Priest. He also spoke about the symbolic nature of Joshua's filthy garments and the people's lack of judgment, mercy and peace.
Malachi
c. 400
Malachi, the last of the minor prophets, wrote about being prepared for the Messenger (John the Baptist) that is to come. His messages was primarily directed toward Israel and the 'Israel of God' today (the church). He spoke against the priests neglecting their duties, as well as chiding the people for practicing divorce, adultery, and robbing God of tithes.