sorting by most recently edited

Hi All

is there a method by which I can filter/sort by the most recently edited (need to know which images have changed recently so that I can update other sites hosting my photos). Looking at the metadata filters I can't see anything that allows me to add an appropriate filter (ie, show images which have been edited today or for some period) or the ability to sort by the last update/edit date?

surely this is possible? what am I missing?

thx
James