Not all moths fly only by night and I've just been watching a delightful little day-flying one in our front garden. it's called a 'small purple and gold' and in appearance is just what it says on the tin. My book of micro-moths (and it is tiny) says that it feeds particularly on herbs like marjoram and that's exactly the plant it was nectaring on. The Latin name literally means 'bright flyer into flames', which isn't quite as helpful (to us or the moth) as the English one.