For washing clothes, remarkably little soap is needed to clean ordinary soiling. Washing machines are very efficient. Using too much, besides simply being a waste, can accelerate the degradation of some fabrics, shortening the life of your clothes, and on the extreme end it results in overproduction of suds. Most washing machines from the last 30ish years will detect this and stop their cycle until the suds have died down, so it also wastes time.
YYYY/MM/DD is best because then you can follow it with HH:MM:SS and everything is in order.