KQL how to search for announcements that are not expired

Question

I'm trying to search in an announcement list. I want the search to return only items, that aren't expired (ows_Expires >= [today]). I found, that ows_Expires is mapped to a managed property called "ExpirationTime". But I don't get, how I can query this in a KQL search string ... I tried using fixed values or today keyword, always returning 0 results:

ExpirationTime>=today
ExpirationTime>=[today]
ExpirationTime>=2013-01-01
ExpirationTime>=01.01.2013

Is there a way to query for this field?

Answer 1

Is it the correct property?

I tried it with write<02/28/2013 and this does work for me.