All that may have come to pass but I recall one hadith as I understood it where a Sahabi came to Rasul Allah PBUH and asked Oh Rasul Allah if you knew that tomorrow was the End of the World, what action would you take?
Our Holy Prophet PBUH replied I would plant a tree!
so the way I interpret that saying is:
No one knows when this world will end, only Allah knows!
The act of planting a tree means you plan for hundreds of years! no matter what.