#define YEAR0           1900                    
#define EPOCH_YR        1970           
#define SECS_DAY        (24L * 60L * 60L)
#define LEAPYEAR(year)  (!((year) % 4) && (((year) % 100) || !((year) % 400)))
#define YEARSIZE(year)  (LEAPYEAR(year) ? 366 : 365)
#define FIRSTSUNDAY(timp)       (((timp)->tm_yday - (timp)->tm_wday + 420) % 7)
#define FIRSTDAYOF(timp)        (((timp)->tm_wday - (timp)->tm_yday + 420) % 7)
#define TIME_MAX        ULONG_MAX
#define ABB_LEN         3

const int _ytab[2][12]= {{31,28,31,30,31,30,31,31,30,31,30,31},{31,29,31,30,31,30,31,31,30,31,30,31}};