C++ DateTime 结构

OS:Win7 ,Tools:VS2015

DateTime.h

#pragma once

struct 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 Chinese

private:
    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 <time.h> 

#include "DateTime.h"
//测试
#include <iostream>

//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<double>(clock() - Elapsed) / CLOCKS_PER_SEC;
}

Main.cpp

#include <iostream>
#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;
}