du jourdu jour /djuː ˈʒʊə $ -ˈʒʊr/ adverb 
the actor/issue/crime etc du jour the actor, issue, crime etc that is particularly popular or frequent at this time: 
Alien invasions are the cinematic theme du jour.
the actor/issue/crime etc du jour the actor, issue, crime etc that is particularly popular or frequent at this time: Alien invasions are the cinematic theme du jour.