Date and Time Format in C++

#include <iostream>
#include <ctime>
using namespace std;
int main( )
{
// current date/time based on current system
time_t now = time(0);
cout << "Number of sec since January 11,1970:" << now << endl;
tm *ltm = localtime(&now);
// print various components of tm structure.
cout << "Year: "<< 1900 + ltm->tm_year << endl;
cout << "Month: "<< 1 + ltm->tm_mon<< endl;
cout << "Day: "<< ltm->tm_mday << endl;
cout << "Time: "<< ltm->tm_hour << ":";
cout << 1 + ltm->tm_min << ":";
cout << 1 + ltm->tm_sec << endl;
}