S_WDAY
state |= S_WDAY | S_MON | S_MDAY | S_YEAR;
state |= S_WDAY;
state |= S_YDAY | S_WDAY |
state |= S_WDAY;
state |= S_WDAY;
state |= S_WDAY;
state |= S_WDAY;
#define HAVE_WDAY(s) (s & S_WDAY)