/*计算年月日所在的星期数 * 蔡勒公式：W = [C/4] - 2C + y + [y/4] + [13 * (M+1) / 5] + d - 1 * C是世纪数减一，y是年份后两位，M是月份，d是日数。 * 1月和2月要按上一年的13月和14月来算，这时C和y均按上一年取值。 * */ 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 = Year0; Weekday = (Century/4) - (2*Century) + Year + (Year/4) + (13 * (Month+1) / 5) + Day - 1; Weekday = Weekday%7; return Weekday; }
