Thanks Bob, but that's not what I'm looking for.
I'm looking for duplicates.
For example, in organizer I tried "if capturetime=capturetime" but it doesn't work.
Are you typing this in the search field exactly as you've shown it here? Because if so, it's not going to work for a few reasons.
First, the "if" is essentially implied in Photo Mechanic Plus Search. It's only going to give you results when the search conditions are true, so the "if" is unnecessary and its probably searching for that word specifically in addition to your other search terms.
Second, unless the capture time value of your image is actually "capturetime", that search is going to come up false.
Have you seen the "Search Examples" window, accessible from the Catalog menu? It has a bunch of examples of how to search by capture time, which I think should give you enough information to find whatever you are looking for. The only thing that I think isn't super clear from that window is the fact that you need to use 24-hour time for the hour value