If you want the clock minute only, use two marker files, one touched to prior minute:00 and the second to current minute:00, and "find . . . -newer f1 ! -newer f2", possibly with an escape on the ! =...
One way would be to create a reference file with a timestamp to look back to. If you run it at 09:34 on 3rd December 2014, and you need to find files newer that 09:33:00 then you can (working out...