The Minor Prophets, in alphabetical order, are Amos, Habakkuk, Haggai, Hosea, Joel, Jonah, Malachi, Micah, Nahum, Obadiah, Zechariah, and Zephaniah. Their books are considered minor since each is much shorter than the writings of Isaiah (sixty-six chapters), Jeremiah (fifty-two chapters), and Ezekiel (forty-eight chapters). If all of their writings were combined into a single book, it would be only two-thirds of the size of Isaiah.
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 Minor Prophets 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.
796 - Amos
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.
740 to 711 - Micah
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.
711 - Nahum
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.
626 - Habakkuk
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.
626 - Zephaniah
Zephaniah's writings 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.
596 to 586 - Joel
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.
590 - Obadiah
Obadiah spoke about the Day of the Lord, Edom's destruction and Israel's restoration as a people.
520 - Haggai
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.
520 to 518 - Zechariah
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.
c. 400 - Malachi
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.