Although the US is officially divided into 9 time zones, the quantity of the time zone IDs is much bigger. Pacific/Guam is one of them. This identifier shows what time is it in exact location now. In this case it is about the time in the US territory.
Pacific/Guam time now
You can see the current time and date of Pacific/Guam time zone here:
Follow the links if you need to convert 24-hour time to 12-hour (AM, PM) or 12-hour format to 24-hour time format.
Current time in Guam, GU?
Since the time in Guam is taken as the basis for the identifier Pacific/Guam, the current time in this area is the same:
Standard time of Pacific/Guam
STD of Pacific/Guam is UTC +10:00 (CHST)
Standard time is the local time in Pacific/Guam time zone when DST (Daylight Saving Time) is not in use.
Daylight Saving Time of Pacific/Guam
DST of Pacific/Guam is UTC +10:00 (CHDT)
It means that Daylight Saving Time is not observed in this location.
Daylight Saving Time is not used in any US territories, but it is actively observed in most states, as well as outside the USA.
Read more about “Abbreviations for Time Zones, names and locations” which are used for identification of Coordinated Universal Time, like EDT, CEST EST, AKDT and others.
Pacific/Guam time zone
Pacific/Guam is the ID which refers to Chamorro Time Zone. Its borders and the states which included to this time zone can be seen on the map of US time zones.