sn The origin of the concept of “the day of the Lord” is uncertain. It may have originated in the ancient Near Eastern idea of the sovereign’s day of conquest, where a king would boast that he had concluded an entire military campaign in a single day (see D. Stuart, “The Sovereign’s Day of Conquest,” BASOR 221 [1976]: 159–64). In the OT the expression is applied to several acts of divine judgment, some historical and others still future (see A. J. Everson, “The Days of Yahweh,” JBL 93 [1974]: 329–37). In the OT the phrase first appears in Amos (assuming that Amos predates Joel and Obadiah), where it seems to refer to a belief on the part of the northern kingdom that God would intervene on Israel’s behalf and judge the nation’s enemies. Amos affirms that the Lord’s day of judgment is indeed approaching, but he declares that it will be a day of disaster, not deliverance, for Israel. Here in Zephaniah, the “day of the Lord” includes God’s coming judgment of Judah, as well as a more universal outpouring of divine anger.