At the Hoover Dam do you know what time it is. It’s a silly question, right, not really. It depends on where and when you stand. One time zone on the dam is in Nevada, another in the state of Arizona. Nevada doesn’t recognize day light saving time so you might really be confused and go to sleep an hour early. Ironically a December sundown is at 4:30 in the City of Las Vegas, the city that never sleeps.