Questions about daylight savings time

Pacific Standard Time (Hawaii) never changes. Same Same year around.
When mainland goes on Daylight Savings Time, there is a 7 hour time difference instead of 6.

I don't know if this goes for American Samoa and Guam which are on the Pacific Rim.

The Newfoundland Time Zone (NT) is a geographic region that keeps time by subtracting 3½ hours from Coordinated Universal Time (UTC), resulting in UTC-3:30, or 2½ hours during Daylight Saving Time. The clock time in this zone is based on the mean solar time of the 52nd degree and 30 arcminute meridian west of the Greenwich Observatory.