Also the energy saving from using less air-conditioning would be a positive effect, maybe not too significant but its better than nothing.Couldn't sociedy just adjust to the high UV rays by nationally mandating nocturnal working/school hours? Sleep during the mid-day (perhaps around 9 am to 5 pm) and work at night (around 8pm to 6am). Also, push as much of school online via this world's equivalent of Zoom/Skype and via Canvas.
It might be an awkward adjustment at first, but I'm sure most people can acclimate to a nocturnal lifestyle. Jogging at the wee hours of the evening. Eating out in the middle of the night, etc.
With society more active at night, cities and suburbs would have to heavily invest in more lighting with double the street lamps and greater public lighting areas.