Conditional formatting formula

Hello my Excel friends,
I'd greatly appreciate your assistance resolving this. I've tried so many different ways . . .
I am determining a range of time and need the CF (Conditional Formatting) to make the cell red if a range is exceeded.

        A1: 0:03
        B1: 0:22
        C1: =MOD(B1-A1,1)
  CF@C1: =IF(C1>0:09,True) <== The result is 0:19 so it should be TRUE and RED, but it isn't.

I've put the 0:09 in single quotes, double quotes, no luck.
Thanks in advance for your wise suggestions.