Why has Sunak chosen the 4th of July?

Rishi Sunak just announced we’re finally going to have a general election. He’s chosen the 4th of July to go to the polls. I think early July is important, it was chosen to try and mitigate the damage young voters will cause the Tories. University summer terms run from April through until June. My guess is Sunak and the Tories are hoping students finishing university for the year will go on holiday. They’re gambling on students and recent graduates choosing a holiday over voting in a general election. I for one hope it backfires.