About UTC time zones
The UTC time zone information is required for the timer to work correctly. Time zones and the use of Daylight and Standard times vary from country to country, and from city to city. The UTC information should be verified for the regional population for which the timer displays.
| Time Zone | US Time Zones | Standard Time Offset--Fall and Winter | Daylight Saving Offset--Spring and Summer |
|---|---|---|---|
| ET | Eastern Time | UTC -0500 EST | UTC -4000 EDT |
| AT | Atlantic Time Puerto Rico |
UTC -0400 AST | unobserved |
| CT | Central Time | UTC -0600 CST | UTC -0500 CDT |
| MT | Mountain Time | UTC -0700 MST | UTC -0600 MDT |
| PT | Pacific Time | UTC -0800 PST | UTC -0700 PDT |
| AKT | Alaska Time | UTC -0900 AKST | UTC -0800 AKDT |
| HT | Hawaii-Aleutian | UTC -1000 HST | UTC -0900 HDT |
| HT | Hawaiian Aleutian |
UTC -1000 HST | unobserved |
| ST | Samoa Time | UTC -1100 SST | unobserved |
| CT | Chamorro Time--Guam | UTC +1000 CST | unobserved |