When # appears in a string in a Print #f, statement, e.g.
Print #f, a; b; c; "ghijk#lmn#op"; d; e; f
everything between the first # and the second # is displayed by Notepad++ as if it were a "date" by default, light green.
Disclaimer: Nothing in the above post implies I am anything but thrilled with notepad++. My only complaint is that nobody told me about it until yesterday.