You can say: There is a time zone difference of 7 hours between Japan and Kuwait. Japan is ahead by 7 hours which means that a new day begins earlier in Japan. Hope that helps! :)

one can understand most when will be sunrise it is one good idea . Japan can see sunrise 7 hour before sunrise. Sunrise is very simple way to understand morning so start business is good but each person have differece but nature act is same to every one your sentence translate " nihon to kuwait dewa 7 jikann no jisa ga ari nihon ha wareware yori saki ni ichinichi ga hajimaru " to it is translation AS i said my way Japan people can see sunrise 7 hour earlier than kwait people . This way translate " Nihon ha kuwait yori 7jikan mae hinode wo miteiru" time expression use natural event sometime easy to tell differece.