Windows编程中几种时间的相互转换

　　本地时间(LocalTime)转UTC时间(Time_t格式)

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

long GetLongTimeByStrInC(char* strTime)
{
    if(strTime == NULL)
        return 0;
    char years[5] ={""}, month[3] = {""}, day[3] = {""}, \
        hour[3] = {""}, minute[3] = {""}, second[3] = {""};
    lstrcpynA(years, strTime, 5);    // 注意strncpy与lstrcpyn的区别
    lstrcpynA(month, strTime + 5, 3);
    lstrcpynA(day, strTime + 8, 3);
    lstrcpynA(hour, strTime + 11, 3);
    lstrcpynA(minute, strTime + 14, 3);
    lstrcpynA(second, strTime + 17, 3);
    tm newTime;
    newTime.tm_year = atoi(years) - 1900;
    newTime.tm_mon  = atoi(month) - 1;
    newTime.tm_mday = atoi(day);
    newTime.tm_hour = atoi(hour);
    newTime.tm_min  = atoi(minute);
    newTime.tm_sec  = atoi(second);
    return mktime(&newTime);
}
int main( void )
{
    tm * newTime;
    time_t szClock = time(NULL);    // 得到当前时间
    newTime = localtime( &szClock );    // 把当前时间转为tm结构体，从而可以得到年月日
    char info[MAX_PATH] = {""};
    char curTime[50] = {""};
    //把当前时间组合成一个字符串:yyyy-MM-dd hh:mm:ss
    sprintf(curTime,"%04d-%02d-%02d %02d:%02d:%02d",newTime->tm_year + 1900,newTime->tm_mon+1,newTime->tm_mday, \
        newTime->tm_hour,newTime->tm_min,newTime->tm_sec);
    sprintf(info,"当前时间: time_t: %d , %s  \r\n",szClock ,curTime);
    printf(info);
    //把组合成的yyyy-MM-dd hh:mm:ss字符串通过mfc函数转为time_t时间
    long lcurtime = GetLongTimeByStrInC(curTime);
    printf("通过c函数把当前时间: %s \n转为:time_t: %d \r\n",curTime,lcurtime);
    system("pause");
    return 1;
} 

　　UTC时间(Time_t格式)转本地时间(LocalTime)

#include <time.h>
#include <Windows.h>

int _tmain(int argc, _TCHAR* argv[])
{
    time_t UnixTime = 1330354352;
    tm ToLocalTime;
    ZeroMemory(&ToLocalTime, sizeof(tm));
    localtime_s(&ToLocalTime, &UnixTime);
    printf("當前時間:%04d-%02d-%02d %02d:%02d:%02d\n", ToLocalTime.tm_year + 1900, ToLocalTime.tm_mon + 1, ToLocalTime.tm_mday,
        ToLocalTime.tm_hour, ToLocalTime.tm_min, ToLocalTime.tm_sec);
    system("pause");
    return 0;
}