InfoPath Dev

Here is what I am trying to use but I know I am doing something wrong with the syntax. Sorry I am just learning all of this.   substring-after(now(), "T"), "  ", userName(), DAY_TEXT_1.0   What I am wanting to see is when a user checks the box I get Time (MILITARY) Username What ever was in the text box ...

I am wondering if there is a way that once a user selects a check box, I can have the data it is representing input with a time/date/username stamp in the rich text box that is read only?

Hey everyone, I am writing a form in which once the user selects a check box it populates the current time in another field and greys out totally once save or submit is pressed, thing is I cannot get it to just display the time once it is checked, everything I try gets date & time using the "now()" value also want to lock the check ...