Allaah created the universe in six days

 

llingly
or unwillingly.’ They both said: ‘We come willingly.’

Then He completed and finished from their creation
(as) seven heavens in two Days and He made in each heaven its affair.
And We adorned the nearest (lowest) heaven with lamps (stars) to be
an adornment as well as to guard (from the devils by using them as missiles
against the devils). Such is the Decree of Him, the All-Mighty,
the All-Knower”[Fussilat 41:9-12] 

And Allaah knows best.