STL中的时间

#include <iostream>#include <ctime>using namespace std;#ifndef CLOCKS_PER_SEC#define CLOCKS_PER_SEC 1000#endifint main(){char tempbuf[128];struct tm * mytime;time_t myclock;clock_t start ,finish;time_t tstart ,tfinish ,tcurr;double duration;long count = 600000000L;time(&myclock);mytime = localtime(&myclock);cout << "Usage of asctime(): " << endl;//ssctime() 用于将指定的时间以字符串的形式输出。cout << "asctime() : Current Data and Time :" << asctime(mytime) << endl;cout << "Usage of ctime(): " << endl;cout << "ctime(): Current Data and Time :" << ctime(&myclock) << endl;cout << "Usage of clock(): " << endl;start = clock();while(count--);finish = clock();duration = (double)(finish - start)/CLOCKS_PER_SEC;cout << "clock(): Consume " << duration << " second." << endl << endl;cout << "Usage of difftime() :" << endl;count = 600000000L;time(&tstart);while(count--);time(&tfinish);duration = tfinish - tstart;cout << "time(): Consume " << duration << "seconds." << endl << endl;cout << "Usage of gmtime() (GMT):" << endl;time(&tcurr);mytime = gmtime(&tcurr);cout << "The current time : " << mytime->tm_year + 1900 << " ," <<  mytime->tm_mon + 1 << " ,"  << mytime->tm_mday << " ,";cout << mytime->tm_hour << " :" << mytime->tm_min << " :" << mytime->tm_sec << " , ";cout << (mytime->tm_isdst? "Night.":"Daylight") << ", " << mytime->tm_wday << ", " << mytime->tm_yday << "th." << endl;cout << endl;cout << "Usage of localtime() :" << endl;time(&tcurr);mytime = localtime(&tcurr) ;cout << "The current time : " << mytime->tm_year + 1900 << " ," <<  mytime->tm_mon + 1 << " ,"  << mytime->tm_mday << " ,";cout << mytime->tm_hour << " :" << mytime->tm_min << " :" << mytime->tm_sec << " , ";cout << (mytime->tm_isdst? "Night.":"Daylight") << ", " << mytime->tm_wday << ", " << mytime->tm_yday << "th." << endl;cout << endl;cout << "Usage of mktime() :" << endl;tcurr = mktime(mytime);cout << "The seconds from 1970/1/1 0:0:0" << tcurr << "seconds." << endl << endl;cout << "Usage of time() :" << endl;time(&tcurr);cout << "time transformed by localtime() :" << asctime(localtime(&tcurr)) ;cout << "time transformed by gmtime() :"  << asctime(gmtime(&tcurr)) << endl;cout << endl;cout << "Usage of strftime() :" << endl;mytime = localtime(&tcurr);strftime(tempbuf ,128 ,"Today is %A ,dat %d of %B in the year %Y.\n" ,mytime);cout << tempbuf << endl;return 0;}