Even this is in error. Las Vegas is not Mountain Time, but Pacific Time. Nevada is the only non coastal state to be entirely on Pacific Time. The few exceptions that exist all observe Mountain Time (UTC -7) and are close to the borders of Idaho or Utah. As a consequence, your narrative would become:

2:31 + 12 + 3 (time zones) = 17:31. <---- Pacific Time

Even this is in error. Las Vegas is not Mountain Time, but Pacific Time. Nevada is the only non coastal state to be entirely on Pacific Time. The few exceptions that exist all observe Mountain Time (UTC -7) and are close to the borders of Idaho or Utah. As a consequence, your narrative would become:

2:31 + 12 + 3 (time zones) = 17:31. <---- Pacific Time

Even this is in error. Las Vegas is not Mountain Time, but Pacific Time. Nevada is the only non coastal state to be entirely on Pacific Time. The few exceptions that exist all observe Mountain Time (UTC -7) and are close to the borders of Idaho or Utah. As a consequence, your narrative would become:

2:31 + 12 + 3 (time zones) = 17:31. <---- Pacific Time