Almost all of Nevada is in the Pacific Time Zone (UTC -8). The few exceptions that exist all observe Mountain Time (UTC -7) and are close to the borders of Idaho or Utah.
Mountain Time is officially observed close to the border to Utah in:
Mountain Time is also unofficially observed in the following Idaho border areas:
IANA time zone database
The zones for Nevada as given by zone.tab of the IANA time zone database, columns marked * are from the zone.tab:
References
Time in Nevada Wikipedia(Text) CC BY-SA