Those skirts would be too short for an interview or client meeting in my region/industry, but I think they'd be fine for business casual in the office...especially with the moderate heels shown. With platform stilettos, no. The length would also be all right in my book if worn in the winter with opaque tights.
I am as tall as a print model and it's almost impossible for me to find skirts that come to the knee on me. Note many dresses well above the knee on the models even at Brooks Brothers, which is about the most conservative business wardrobe you can find.
http://www.brooksbrothers.com/womens...efault,sc.html