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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