[WirelessGigabit]

I just had someone asking me if I'm available at 5pm EST.

Also, your clock can get confused driving North from PHX to Zion National Park.

In summer you start in Mountain Standard Time, drive into the Navajo Nation which does observe Mountain Daylight Time, containing through the Hopi Reservation, which is Mountain Standard Time. Then you end up back in Navajo Nation with Mountain Daylight Time. You keep on driving towards Page which is in Mountain Standard Time. However, when you cross the state-border of AZ/UT you're back in Mountain Daylight Time.

My clock threw a segmentation fault.