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