OS:Win7 ,Tools:VS2015

DateTime.h

#pragma oncestruct DateTime{public:    unsigned Year;     // years since 1900     unsigned short Month;     // months since January - [0, 11]     unsigned short Day;         // day of the month - [1, 31]    unsigned short Hour;     // hours since midnight - [0, 23]    unsigned short Minute;     // minutes after the hour - [0, 59]    unsigned short Seconds;     // seconds after the minute - [0, 60] including leap second    //unsigned short DayOfWeek;// days since Sunday - [0, 6]    //unsigned short DayOfYear;// days since January 1 - [0, 365] public:    //ctor    DateTime(unsigned y, unsigned short m, unsigned short d, unsigned short h, unsigned short mi, unsigned short s);    DateTime();public:    //Is LeapYear    bool IsLeapYear();    //Day Of Week    const char* DayOfWeek();    /*Day Of Year*/    int DayOfYear();public:    //Start Elapsed    static void Start();    //End Elapsed , return Secs    static double End(); private:    const char* _WeekDay_CHS[7] = { "Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday" };//Week Of English    const char* _WeekDay_ENG[7] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };//Week Of Chineseprivate:    const int DaysOfMonth[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };//Days of Month    //const int* _DaysOfMonth = new int[12]{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };private:    //静态变量必须在外部初始化    static long Elapsed;     };

DateTime.cpp

//localtime 函数#define _CRT_SECURE_NO_WARNINGS#include 
      
        #include "DateTime.h"//测试#include 
       
        //初始化静态变量long DateTime::Elapsed = NAN;//数据丢失警告忽略。DateTime::DateTime(unsigned  y, unsigned short m, unsigned short d, unsigned short h, unsigned short mi, unsigned short s){    Year = y;    Month = m;    Day = d;    Hour = h;    Minute = mi;    Seconds = s;}DateTime::DateTime(){    //结构值 为 1990年0月 起 0：星期日，1：星期一    time_t dt;    struct tm* now;    time(&dt);    now = localtime(&dt);    /*    出错误    time_t dt;    struct tm* now = { 0 };    localtime_s(now, &dt);    */    Year = now->tm_year + 1900;    Month = now->tm_mon + 1;    Day = now->tm_mday;    Hour = now->tm_hour;    Minute = now->tm_min;    Seconds = now->tm_sec;}bool DateTime::IsLeapYear(){    return ((Year % 4 == 0 && Year % 100 != 0) || (Year % 400 == 0));}int DateTime::DayOfYear(){    int tmp = 0;    //取数组长度    int len = (sizeof(DaysOfMonth) / sizeof(DaysOfMonth[0]));    //测试    //std::cout << len << std::endl;    for (int i = 0; i < Month - 1; i++)    {        tmp += DaysOfMonth[i];    }    if (IsLeapYear())        tmp++;    return tmp + Day;}const char* DateTime::DayOfWeek(){    /*//方法一：蔡勒公式,公式中的除法取整数。        符号意义：  w:星期 eg:{0=星期日，1=星期一，...}                    c:年数前两位 eg:{2015 c=20}                    y:年数后两位 eg:{2015 y=15}                    m:月 eg:{2015年2月28日 m=14,此时y=2014}  注意 1,2月要当成上一年的13,14月计算                    d:日 eg:{28日 d=28}        ① w=(y + y/4 + c/4 - 2*c + (26 * (m+1))/10 + d - 1) %7      或② w=(c/4 - 2*c + y + y/4 + (13 * (m+1))/5 + d -1) %7    unsigned  w, c, y, m, d;    c = Year / 100;    y = Year % 100;    m = Month;    if (Month == 1 || Month == 2)    {        y--;        m += 12;    }    d = Day;    w = (c / 4 - 2 * c + y + y / 4 + (13 * (m + 1)) / 5 + d - 1) % 7;    return _WeekDay_CHS[w];    */    /*//方法二：基姆拉尔森公式,公式中的除法取整数        符号意义：  w:星期 eg:{6=星期日，0=星期一，...}                    y:年数 eg:{2015 y=2015}                    m:月 eg:{2015年2月28日 m=14,此时y=2014}  注意 1,2月要当成上一年的13,14月计算                    d:日 eg:{28日 d=28}         w=(d + 2*m + 3*(m+1)/5 + y + y/4 - y/100 + y/400) %7    unsigned  w, y, m, d;    y = Year;    m = Month;    if (Month == 1 || Month == 2)    {        y--;        m += 12;    }    d = Day;    w = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7 +1;    //std::cout << w << std::endl;    return _WeekDay_CHS[w];    */    /*//方法三：基数法,公式中的除法取整数        1.年基数yb：            平年=1，            闰年=2。        2.月基数mb：该月之前(不含该月)的每月天数的总和除以7取余            平年={0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5}，            闰年={0, 3, 4, 0, 2, 5, 0, 3, 6, 1, 4, 6}。        3.符号意义：            w:星期 eg:{0=星期日，1=星期一，...}            y:年份 eg:{2015年3月4日 y=2015}            yb:年基数 eg:{2015年3月4日 yb=1}            mb:月基数 eg:{2015年3月4日 mb=3}            d:日 eg:{2015年3月4日 d=4}        w=(y + y/4 + y/400 - y/100 - yb + mb + d)%7    */    int NLY[12] = { 0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5 };    int    LY[12] = { 0, 3, 4, 0, 2, 5, 0, 3, 6, 1, 4, 6 };    unsigned y, yb, mb, d, w;    if (IsLeapYear())    {        yb = 2;        mb = LY[Month - 1];    }    else    {        yb = 1;        mb = NLY[Month - 1];    }    y = Year;    d = Day;    w = (y + y / 4 + y / 400 - y / 100 - yb + mb + d) % 7;    return _WeekDay_CHS[w];}void DateTime::Start(){    Elapsed = clock();}double DateTime::End(){    //测试    /*long tmp = clock() - Elapsed;    std::cout << tmp << std::endl;*/    return static_cast
        
         (clock() - Elapsed) / CLOCKS_PER_SEC;}
        
       
      

Main.cpp

#include 
     
      #include "DateTime.h"using namespace std;int main(){    DateTime::Start();    //DateTime::Now();    //DateTime dt2(1997, 3, 4, 22, 58, 31);    DateTime dt2;    cout << dt2.Year << "年" << dt2.Month << "月" << dt2.Day << "日" << dt2.Hour << "时" << dt2.Minute << "分" << dt2.Seconds << "秒" << endl;    cout << dt2.IsLeapYear() << endl;    cout << dt2.DayOfYear() << endl;    cout << dt2.DayOfWeek() << endl;    cout << DateTime::End() << endl;    getchar();    return 0;}