Douglas Harper's Etymology Dictionary
from French plat du jour "dish of the day," early 20c. on restaurant menus, abstracted as an all-purpose modifier 1989.
Wiktionary
a. 1 Of the day; prepared for the day in question 2 (context by extension English) currently stylish; en vogue; trendy.
Usage examples of "du jour".
She hurried away to her desk, a little satinwood bonheur du jour that had belonged to Jack's mother, and after some hesitation she wrote, 'Dear Jack - may I beg for forgiveness?
My fingerprints are stained with beet juice (hot borscht as soupe du jour yesterday), and if I hold my fingers to my nose, I can still smell smoked salmon, chopped shallots and a hint of Morbier rind.
She sent the sex toy to Belle du Jour, but the contact phone didn’.
Having an interesting theory du jour helped my concentration at the prison.
And I'd do just about anything, even interrogate the ghost of a kindergartner, to take my mind off the problem du jour.
Inside was a wonderful surprise, for the menu included both ordinary fare and a single plat du jour of the highest gourmet quality, with wines to match.
Randy puts that golden master into his Walkman and hits the Play button and is treated to some passable post-Cobain-mortem material, genetically engineered to have nothing in common with what is traditionally thought of as the Seattle sound and in that sense absolutely typical of Seattle du jour.
So the cover story du jour, freshly spun by Lieutenant Ethridge, is that Detachment 2702 is (contrary to all outward appearances) an elite, crack medical team concerned that Hott had been struck down by a rare new form of North African food poisoning.