C++时间标准库时间time和系统时间SYSTEMTIME的使用

作者: admin 分类: C++,SOUI 发布时间: 2019-08-08 16:34

1. C++标准库中的时间需要引用time.h,可以取的本地时间或者格林威治时间,只能精确到秒

#include <iostream>
 
/*包含time头文件*/
#include <time.h>
 
 
using namespace std;
 
int main()
{
    //time_t是long类型,精确到秒,是当前时间和1970年1月1日零点时间的差
    const time_t t = time(NULL);
 
    cout<<"current time is "<<t<<endl;
 
    /*本地时间:日期,时间 年月日,星期,时分秒*/
    struct tm* current_time = localtime(&t);
    printf("current year is %d;current month is %d;current date of month is %d\r\n",
        1900 + current_time->tm_year,
        1 + current_time->tm_mon/*此month的范围为0-11*/,
        current_time->tm_mday);
 
    printf("current day of year is %d;current day in week is %d\r\n",
        current_time->tm_yday,/*当前日期是今年的第多少天[0,365] */
        current_time->tm_wday/*days since Sunday - [0,6] */);
 
    printf("time part %d:%d:%d \r\n",
        current_time->tm_hour,
        current_time->tm_min,
        current_time->tm_sec);
 
    printf("\t本地时间:%d-%d-%d %d:%d:%d\r\n",
        current_time->tm_year + 1900,
        current_time->tm_mon + 1,
        current_time->tm_mday,
        current_time->tm_hour,
        current_time->tm_min,
        current_time->tm_sec);
 
    /*格林威治时间*/
    struct tm* current_gmtime = gmtime(&t);
 
    printf("格林威治时间:%d-%d-%d %d:%d:%d\r\n",
        current_gmtime->tm_year + 1900,
        current_gmtime->tm_mon + 1,
        current_gmtime->tm_mday,
        current_gmtime->tm_hour,
        current_gmtime->tm_min,
        current_gmtime->tm_sec);
 
 
    system("pause");
    return 0;
}

 

2. 系统时间 SYSTEMTIME 使用时要引用windows.h,可以精确到毫秒级别

#include <iostream>
#include <Windows.h>
 
 
int main(){
    //声明变量
    SYSTEMTIME sys_time;
 
    //将变量值设置为本地时间
    GetLocalTime( &sys_time );
 
    //输出时间
    printf( "%4d/%02d/%02d %02d:%02d:%02d.%03d 星期%1d\n",sys_time.wYear,
        sys_time.wMonth,
        sys_time.wDay,
        sys_time.wHour,
        sys_time.wMinute, 
        sys_time.wSecond,
        sys_time.wMilliseconds,
        sys_time.wDayOfWeek);
 
    system("time");
 
    system("pause");
    return 0;
}

 

SYSTEMTIME 获取日期之差

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ATLComTime.h>
#pragma once 
#pragma warning(disable:4996)

int CompareSystemTime(SYSTEMTIME &stStart, SYSTEMTIME &stEnd)
{//获取两个    SYSTEMTIME的日期之差
    COleDateTime m_tStartDate;
    COleDateTime m_tEndDate;
    m_tStartDate.SetDate(stStart.wYear, stStart.wMonth, stStart.wDay);
    m_tEndDate.SetDate(stEnd.wYear, stEnd.wMonth, stEnd.wDay);
    
    COleDateTimeSpan nDays = m_tEndDate - m_tStartDate;
    return (int)nDays.GetDays();
}

SYSTEMTIME GetDateAdded(SYSTEMTIME &stStart)
{//起始日期增加一天
    COleDateTime m_tStartDate;
    m_tStartDate.SetDate(stStart.wYear, stStart.wMonth, stStart.wDay);

    COleDateTimeSpan ts2(1); 
    m_tStartDate += ts2;
    SYSTEMTIME stTemp;
    stTemp.wYear = m_tStartDate.GetYear();
    stTemp.wMonth = m_tStartDate.GetMonth();
    stTemp.wDay = m_tStartDate.GetDay();
    return stTemp;
}

//主函数
int main(void)
{
    SYSTEMTIME st, st1;
    st.wYear = 2014;
    st.wMonth = 12;
    st.wDay = 31;
    GetLocalTime(&st1);
    
    int nDays = CompareSystemTime(st, st1);
    printf("%d\n", nDays);

    st = GetDateAdded(st);
    printf("%d-%02d-%02d\n", st.wYear, st.wMonth, st.wDay);
    nDays = CompareSystemTime(st, st1);
    printf("%d\n", nDays);
    return 0;
}

 

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