just checked the link I provided and saw it wasn't the one I wanted to post, here's the correct one:
Moon Phase Calculator
It's a more practical site, you can adjust for time and longitude/latitude as well - nice toy :-)
Re. setting of the monphase, I think it's said already but IIRC it's correct that moonphase is switching/engaged around noon - so this should be avoided for setting of course.
Best regards
Suitbert