Angenommen, das Datum, das Sie "ersetzen" müssen, ist in A1 abwärts. Einfach gesagt:
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1,"November","November"),"Oktober","October"),"September","September"),"August","August"),"Juli","July"),"Juni","June"),"Maj","May"),"April","April"),"Marts","March"),"Februar","February"),"Januar","January")
in B1 ziehen, dann nach unten ziehen. Hoep hilft es. (: