<P> In 2015, Rep. Elizabeth Scott (R - Monroe) filed a House bill to end DST in Washington, and a companion bill was filed in the Senate . She told a House committee that the semiannual time switches are not only inconvenient but lead to health problems and accidents due to lost sleep . She added that the bill to drop daylight saving time would reduce heart attacks, car wrecks, and work accidents found to increase with the sleep - schedule disruptions . A different Senate Bill would petition the federal government for year - round DST . The bills were defeated . </P> <P> All U.S. insular territories with civilian government (American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the Virgin Islands) lie in the tropics and do not observe DST . </P> <P> While neighboring Samoa began observing DST in September 2010, the smaller American Samoa cannot legally follow because of the DST observation period mandated by the Uniform Time Act . This period is actually wintertime in this Southern Hemisphere territory . </P> <P> Many computer operating systems (such as Microsoft Windows, Linux, UNIX, and macOS) and programming languages (such as Java, perl, and most shell languages) allow a local time zone setting in the format of (standard time zone abbreviation) (UTC hour difference) (daylight saving time zone abbreviation). This allows programs and programming languages that must do calculations based on local time to more easily calculate differences between local time and UTC, as well as knowing whether calculations should be changed during daylight saving time . For example, a time zone setting of EST5EDT indicates that local time on the computer is 5 hours behind UTC and should be adjusted for daylight saving time . </P>

What places do not observe daylight savings time