获得某年某月第几周第几天是几月几号

#include int get_Weekday(int Year,int Month,int Day) { int Weekday=0, Century=0; if (1 == Month ) { Month = 13; Year = Year -1; } else if (2 == Month ) { Month = 14; Year = Year -1; } Century = (Year/100); Year = Year%100; Weekday = (Century/4) - (2*Century) + Year + (Year/4) + (13 * (Month+1) / 5) + Day - 1; Weekday = Weekday%7; if (Weekday < 0) { Weekday += 7; } return Weekday; } int main(int argc, char * argv[]) { int year,month,weekofmonth,dayofweek,weekday; int sumday = 0; int leap = 0; if (argc != 5) { printf("invalid pararm! year month nweek weekdays\n"); return 1; } year = atoi(argv[1]); month = atoi(argv[2]); weekofmonth = atoi(argv[3]); dayofweek = atoi(argv[4]); printf("year %d month %d weekofmonth %d weekdays %d\n", year, month, weekofmonth, dayofweek); weekday = get_Weekday(year, month, 1); printf("weekday %d\n", weekday); if (0 == weekday) { sumday = (weekofmonth - 1) * 7 + dayofweek; } else { sumday = 7 - weekday + ( weekofmonth - 1) * 7 + dayofweek; } printf("%d/%d/%d\n", year, month, sumday); return 0; }