I like yours too, Andy. I don't put a date or time on mine anymore; though I did used to put a date.
But I'd be at work, clean my first house and go to leave a 'chit' and I couldn't remember what the date was and it all seemed like too much 'trouble', so I missed it off and I've not had any problems with that.
I also advertise my other services on my 'chit', but I particularly like the way you can direct your customers to your website in a sort of oblique manner, where you could push your other services more directly; and it also probably adds to your professional image in the eyes of your customers.
I'm going to copy!