You're right -- up to a point. Throughout history some people have claimed to know exactly when the world was going to come to an end -- and they were clearly wrong. Jesus said, "No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father" (Matthew 24:36).
But there is one prophecy about the future that I urge you not to ignore or dismiss as nonsense -- and that is the one spoken by Jesus. Jesus warned that someday this world as we know it will come to an end -- not because of a war or natural disaster, but because God will intervene and bring it to an end. The future is in God's hands, and He alone will bring an end to the world.
And when He does, all the evils of this world will be destroyed and Jesus Christ will come again to rule over a new world in perfect peace and justice. We can barely imagine this, but it gives us hope for a better world. As the Bible says, "In keeping with his promise we are looking forward to a new heaven and a new earth, the home of righteousness" (2 Peter 3:13).
Don't worry about those who falsely claim to know when the world will come to an end. Instead, put your faith and trust in Jesus Christ. He alone gives us hope for the future and strength for our lives right now. Make Him the foundation of your life -- beginning today.