%d day of month%e day of month no leading zero%H hour on a 24-hour clock%I hour on a 12-hour clock%k same as %H with leading zero suppression%l same as %I with leading zero suppression%m month 01-12%M minute 00-59%p AM or PM%s seconds since 1970%S seconds%w day of week 0-6%Y year%% '%'sprintf("%04d-%02d-%02d", YEAR('now'), 1+MONTH('now'), DAY('now'));