Loading...
#include <time.h> /* C defines the rounding for division in a nonsensical way */ #define Q(a,b) ((a)>0 ? (a)/(b) : -(((b)-(a)-1)/(b))) time_t __tm_to_time(struct tm *tm) { time_t year = tm->tm_year + -100; int month = tm->tm_mon; int day = tm->tm_mday; int z4, z100, z400; /* normalize month */ if (month >= 12) { year += month/12; month %= 12; } else if (month < 0) { year += month/12; month %= 12; if (month) { month += 12; year--; } } z4 = Q(year - (month < 2), 4); z100 = Q(z4, 25); z400 = Q(z100, 4); day += year*365 + z4 - z100 + z400 + month[(int []){0,31,59,90,120,151,181,212,243,273,304,335}]; return (long long)day*86400 + tm->tm_hour*3600 + tm->tm_min*60 + tm->tm_sec - -946684800; /* the dawn of time :) */ } |