GMT+12 GMT+11 GMT+10 GMT+9 GMT+8 GMT+7 GMT+6 GMT+5 GMT+4 GMT+3 GMT+2 GMT+1 GMT GMT-1 GMT-2 GMT-3 GMT-4 GMT-5 GMT-6 GMT-7 GMT-8 GMT-9 GMT-10 GMT-11 GMT-12 GMT-13 GMT-14 (unimplemented)