How Do Buddhists Believe The World Was Created?

It says in the scriptures where buddha says he travelled back into the past 91,000 Kalpa within a blink. [ Kalpa : If there is a rock as big as the mount "Gijja Kuta" and a person uses a silk to rub it off only once a day, Kalpa is the time it takes to completely wipe off the mountain ] He travelled at the speed of 91,000 Kalpa per blink, for 7 days back into the history to find no such creation date. He rated this question as one of the irrelevent useless ones. During his travel to the history he also found the existance of 27 more Buddhas. Thus he also mensioned that the question of "who is the first buddha?" is also irrelevent and useless. He also added that the length, height, width of the universe is also irrelevent and useless.