You will need 3 profiles, 1 for each time frame you have. (You could do this with one profile using the new Time context that accepts a variable, but I'm not going to get into that).
Set each one to run at the beginning of your time frame, so 5, 12, and 17 respectively.
Each of those profiles' tasks starts with a Variable Set action: Name: %myuccwtext Value: "in the morning", "in the afternoon", and the third one would be "in the evening".
Again in all 3 profiles, use the action I pointed out in my previous post to send %myuccwtext to UCCW, using whatever name you like for the UCCW variable.