12 AM Pacific Time (PT) is the moment when the clock strikes midnight at the beginning of a new day in the Pacific Time Zone (PTZ), which observes Coordinated Universal Time (UTC) minus eight hours (UTC-08:00). In other words, when it is 12:00 AM PT, it is 08:00 AM UTC.
The Pacific Time Zone spans the westernmost part of North America, including the US states of Washington, Oregon, and California, as well as the Canadian province of British Columbia. It is also observed in parts of Mexico and Central America.