The concept of timezones is fine, we need a way to differentiate when days start so its a bit silly for everyone to go off of UTC or any other clock, how are you going to track the exact date, is half the world just going to go from the 8th to the 9th during their workday

What can be fixed, is making timezones uniform amd straight lines, not zigzagging abominations where its possible to drive due north and have a time change 8+ times.