The Day of the Lord

The day of the lord is not a concept that is unique to joel in any way. It shows up 13 other times in the prophetic books of your testament, in the mouths of seven other prophets. For amos, it's judgment n on israel because of their wickedness and abuses canan. In zephaniah its judgment on judah for their greed and complacency. To jeremiah, it was the destruction of egypt for how they abused god's people. And in ind obadiah, remember obadiah o edom, bad things are coming. They're all wrong cause you know what happened a yet.