| Atlantic standard time (AST) | subtract 4 hours from UTC |
| Eastern daylight time (EDT) | subtract 4 hours from UTC |
| Eastern standard time (EST) | subtract 5 hours from UTC |
| Central daylight time (CDT) | subtract 5 hours from UTC |
| Central standard time (CST) | subtract 6 hours from UTC |
| Mountain daylight time (MDT) | subtract 6 hours from UTC |
| Mountain standard time (MST) | subtract 7 hours from UTC |
| Pacific daylight time (PDT) | subtract 7 hours from UTC |
| Pacific standard time (PST) | subtract 8 hours from UTC |
| Alaska daylight time (AKDT) | subtract 8 hours from UTC |
| Alaska standard time (AKST) | subtract 9 hours from UTC |
| Hawaii-Aleutian daylight time (HADT) | subtract 9 hours from UTC |
| Hawaii-Aleutian standard time (HAST) | subtract 10 hours from UTC |
| Samoa standard time (SST) | subtract 11 hours from UTC |
| Chamorro standard time (ChST) | add 10 hours to UTC |