My 2013 Impreza had buttons on the dash for hour and minute. I'm surprised the Forester is much different. My Wife's VW, you set the time in the LCD Menu between the speedo and RPM gauge. It even has a daylights savings time check box. So you only have to check or uncheck the box in the LCD Menu.
And yes, an AWD car will chew up tires. Make sure you get an alignment while putting on the new tires.
And I agree with Cuda, just get a USB adapter for the 12V plug. The only time I ever use the built in USB is if I want to listen to music on my phone.