GMT - 8:30
GMT Clock (GMT MINUS 8:30 HOURS)
Universal Coordinated Time Clock (UTC-8:30) The Greenwich Mean Time minus eight hours thirty minutes is also an empty slot because no country in the world is known to use GMT-8:30 hrs as their country standard time as it does not seem to suit any one to be even considered as a candidate for country standard time.
Country Standard Time GMT-8:30
GMT-8:30 is presently not being used as country standard time by any country in the world. But some day it could be used.