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
Royal Standard of Thailand to the 'Thong Chudhathipathai' (ธงจุฑาธิปไตย). In 1910 King Vajiravudh replaced the Royal Standard and Royal rank flags to mirror the change of the National emblem from the Coat of Arms of Siam to the Royal Garuda. These flags are retained and in use to this day. Six years later he also redesigned the national flag and naval ensigns. Royal Standard of Thailand The Royal Standard of Thailand ( "Thong Maharat") is the official flag of the King of Thailand. The standard was adopted in its present form in 1910 under King Vajiravudh (Rama VI), superseding the first Royal Standard created