getweekdayccode.txt

Get what is the WeekDay

#include <stdio.h> 
#include <windows.h> 
#include <time.h> 

/* 

函数名称：int GetWeekDay(int year,int month,int day) 

函数功能: 返回输入日期对应的一周中的第几天。 

函数参数：year 输入日期的年；month 输入日期的月；day输入日期的日 

如：2000年1月1日则是GetWeekDay(2000,1,1) 

*/ 

int GetWeekDay(int year,int month,int day) 

{ 

int i,j,count=0; 

int Day_Index; 

int days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; 

int MonthAdd[12] = {0,31,59,90,120,151,181,212,243,273,304,334}; 

#if 0 

for(i = 1;i < month;i++) 

count = count + days[i]; 

#else 

count = MonthAdd[month-1]; 

#endif 

count = count + day; 

if((year%4 == 0&&year %100 != 0||year % 400 == 0)&& month >= 3) 

count += 1; 

count = count + (year - 1901) * 365; 

for(j = 1901;j < year;j++) 

{ 

if(j % 4 == 0 && j % 100 != 0 || j % 400 == 0) 

count++; 

} 

return ((count+1) % 7); 

} 

main() 

{ 

const char *Week[]={"星期日","星期一","星期二","星期三","星期四","星期五","星期六"}; 

struct tm * Local; 

long t; 

int year,month,day; 

#if 0 

//下面仅仅是拿当前的日期作为计算，当然你也可以用来计算其他的日期。 

//如：2000年1月1日则是GetWeekDay(2000,1,1) 

t = time(NULL); 

Local = localtime(&t); 

year = Local->tm_year + 1900; 

month = Local->tm_mon + 1; 

day = Local-> tm_mday; 

printf("%d年%d月%d日\t",year,month,day); 

puts(Week[GetWeekDay(year,month,day)]); 

//下面是访问tm结构体来得到当前是星期几 

printf("%d年%d月%d日\t",year,month,day); 

puts(Week[Local->tm_wday]); 

#else 

year = 2006; 

month = 10; 

day = 1; 

printf("%d年%d月%d日\t",year,month,day); 

puts(Week[GetWeekDay(year,month,day)]); 

#endif 

system("pause"); 

}