So it's easy my friend) Pacific Time Zone is one of the 25 available time zones that currently covers parts of the United States of America, Canada, and Mexico. If this information is not enough for you, come here. This is the standard time in these parts of the world, also called Pacific Standard Time (PST). In these places, standard time is calculated as UTC - 8 hours. UTC is also called Coordinated Universal Time, which is the successor to GMT.