linux C++ 获取当前日期时间

#include <boost/algorithm/string.hpp>
#include <string>
#include <vector>
#include <iostream>
#include <ctime>
using namespace std;

string datetime(){
time_t now = time(0);// 基于当前系统的当前日期/时间
tm *ltm = localtime(&now);

char iyear[50],imonth[50],iday[50],ihour[50],imin[50],isec[50];
sprintf(iyear, "%d",1900 + ltm->tm_year );
sprintf(imonth, "%02d", 1 + ltm->tm_mon );
sprintf(iday, "%02d", ltm->tm_mday );
sprintf(ihour, "%02d", ltm->tm_hour );
sprintf(imin, "%02d",  ltm->tm_min);
sprintf(isec, "%02d",  ltm->tm_sec);

vector<string> sDate{iyear, imonth, iday};
vector<string> sTime{ihour, imin, isec};
string myDate = boost::algorithm::join(sDate, "-") ;
string myTime = boost::algorithm::join(sTime, ":") ;
vector<string> sDateTime{myDate, myTime};
string myDateTime = boost::algorithm::join(sDateTime, " ") ;
return myDateTime;
}

int main( )
{
cout << datetime()<< endl;
}

[root@localhost cdatetime]# g++ cdatetime.cpp -o idatetime -std=gnu++0x