Time zone? What time zone

Las Vegas is a part of the Pacific Time Zone (GMT -8), but the only time that really matters is if you have tickets to a show, are meeting someone at a certain time and getting to the airport on time for your flight back home. Jet lag won't be an issue no matter where you're coming from, because there's no need to reset your internal clock. Las Vegas is truly a 24-hour town, so you'll find just about as much going on at 2 in the morning as there is at 2 in the afternoon.