Hawaii–Aleutian Time Zone Hawaii–Aleutian Time Zone The Hawaii–Aleutian Time Zone observes Hawaii–Aleutian Standard Time (HST), by subtracting ten hours from Coordinated Universal Time (). The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory. The zone takes its name from the two areas it includes: Hawaii and the portion of Alaska's Aleutian Islands west of 169° 30′ W longitude. During daylight saving time, the Alaskan portion observes Hawaii–Aleutian Daylight Time (HDT, ), while Hawaii stays on standard time. From 1900 until 1947, GMT−10:30 was used as standard time in Hawaii. French
Standard Tibetan cultural identity in the area. The adjacent Balti language is also in severe danger, and unlike Ladakhi, it has already been replaced by Urdu as the main language of Baltistan, particularly due to settlers speaking Urdu from other areas moving to that area. Standard Tibetan Standard Tibetan is the most widely spoken form of the Tibetic languages. It is based on the speech of Lhasa, an Ü-Tsang (Central Tibetan) dialect. For this reason, Standard Tibetan is often called Lhasa Tibetan. Tibetan is an official language of the Tibet Autonomous Region of the People's Republic of China. The written language is