To friends play a private round of golf. When they reach 16th hole it is too dark to continue play, and they decide to play the two last holes the next day. I am quite sure that nothing in the rules prevents them from doing so or penalises them - do you agree (rule 6-7 - there are no play to delay since everybody has left the golf course?)?
I guess that their handicap also can be adjusted in this situation (although dividing a round over two days) - but this of course depends on which country it is.