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.

Table 1. Generalized Time Zones In The United States
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


UTC -1000 HST unobserved
ST Samoa Time UTC -1100 SST unobserved
CT Chamorro Time--Guam UTC +1000 CST unobserved