orta kün

/ orta kyn /

Cases

SingularPluralWhen to use it
nominative orta kün the Thursday orta künle the Thursdays the plain dictionary form — the doer of the sentence
genitive orta künnü the Thursday's orta künleni the Thursdays' the owner — whose it is
accusative orta künnü the Thursday (as the object) orta künleni the Thursdays (as the object) a specific, known object — whom or what
dative orta künge to the Thursday orta künlege to the Thursdays direction or recipient — to where, to whom
locative orta künde at / in the Thursday orta künlede at / in the Thursdays where it is; also having — mende bar, "I have it"
ablative orta künden from the Thursday orta künleden from the Thursdays where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
my orta künüm my Thursday orta künlerim my Thursdays
your orta kününg your Thursday orta künlering your Thursdays
his / her orta künü his / her Thursday orta künleri his / her Thursdays
our orta künübüz our Thursday orta künleribiz our Thursdays
you all's orta künügüz you all's Thursday orta künlerigiz you all's Thursdays
their orta künleri their Thursday orta künleri their Thursdays

The overlap in the last rows is real, not a mistake: orta künleri can mean "his / her Thursdays", "their Thursday", or "their Thursdays" — context decides.