Jehan de Vezelay, John of Jerusalem, was a prophet who lived in the old medieval times. His forecasts are not directly relating to a specific date in the future, but John speaks in his texts of the millennium that comes after the millennium.
One of his prophecies is:
When the sun will burn the earth
The air will no longer protect us from the fire
It will only be a curtain full of holes
and the burning light will absorb all eyes and skins.
The sea will foam like boiling water
the cities and rivers will be buried.
Entire continents will disappear
People will flee to higher grounds
and they will start to rebuild and forget what has happened.