3 Chapters, 73 verses, 2,034 words.
The prophet Joel cannot be identified with any of the 12 other figures in the OT who have the same name. He is not mentioned outside the books of Joel and (Acts 2:16). The non-Biblical legends about him are unconvincing. His father, Pethuel (1:1), is also unknow. Judging from his concern with Judah and Jerusalem (2:32; 3:1,6,8,16-20), it seems likely that Joel lived in that area.
The book contains no references to datable historical events. Many interpreters date it somewhere between the late seventh and early fifth centuries B.C. In any case, its message is not significantly affected by its dating.
The book of Joel has striking linguistic parallels to the language of Amos, Micah, Zephaniah, Jeremiah and Ezekiel. Some scholars maintain that the prophets borrowed phrases from one another; others hold that they drew more or less from the religious literary traditions that they and their readers shared in common - liturgical and otherwise.
Joel sees the massive locust plague and severe drought devastating Judah as a harbinger of the "great and dreadful day of the Lord (2:31). (The locusts he mentions in 1:4; 2:25 are best understood as real insects, not as allegorical representations of the Babylonians, Medo-Persians, Greeks and Romans, as held by some interpreters.) Confronted with this crisis he calls on everyone to repent: old and young (1:2-3), drunkards (1:5), farmers (1:11) and priests (1:13). He describes the locusts as the Lord's army and sees in their coming a reminder that the day of the Lord is near. He does not voice the popular notion that the day will be one of judgment on the nations but deliverance and blessing for Israel. Instead - with Isaiah (2:20-21), Jeremiah (4:5-9), Amos (5:18-20) and Zephaniah (1:7-18) - he describes the day as one of punishment of unfaithful Israel as well. Restoration and blessing will come only after judgment and repentance.