المنطقة الزمنية HAST — المعنى، إزاحة UTC

HAST stands for Hawaii-Aleutian Time - Honolulu, East Honolulu, Pearl City, Makakilo / Kapolei / Honokai Hale and represents UTC-10:00. Note that HAST is used by 2 different zones, so the correct offset depends on the location you mean.