The Cardano Vasil hard fork will happen on Sept 22nd at the start of epoch 365
The hard fork will bring some important changes to Cardano and enable a lot more dApps to launch. The changes the hard fork brings will take 5 days / 1 epoch to kick in so the hard fork happens on Sept 22nd and then on Sept 27th the changes will be active on the network.
What is the Cardano Vasil Hard Fork
If you not sure of what the hard fork will do for Cardano I created the video below to go through what these changes will do for Cardano.