Too late I'm sure, but moon light is as white as day light. So if you don't know how to set the white balance correctly, just put the whitebalance for cloudy weather. The colours will be quite faithful then.
And next time when you want white to be white, photograph a white piece of paper and set custom whitebalance to that. If you have street lights lighting the paper that will not work since the street lights with not have white light, and you adjusting to the street lights will make all colour look very strange. So then still, shooting at "clouded" setting and in RAW if you need the extra room to adjust later is your best shot.