Date arithmetic in C++ - c++

Question

I have been trying to write a C++ program, that requires me to do date arithmetic.
For example today's date (9-30-2014) minus 4 days and have it return 9-26-2014, or today date plus 3 days returning 10-3-2014.
My original thought process is to use
ctime
which will return the date in seconds from jan 1 1970, I could then add or subtract a set number of seconds for the number of days and pass the result into "put_time" a part of
iomanip
to start I am just trying to get this method to print the correct date, but I can not get the compiler to recognize "put_time"
I am using eclipse version (4.4.0)
with "version 4.1.11(2)-release (x86_64-unknown-cygwin)" as a compiler
From research I have found that "put_time" is only included in certain versions of c++ and I tried running this command
`-std=c++0x`
However I am still receiving the same error "'put_time' was not declared in this scope".
this is the code I am running so far:
//============================================================================
// Name : Date.cpp
// Author : me
// Version :
// Copyright : Your copyright notice
// Description : date calculations
//============================================================================
#include <iostream>
#include <iomanip> // std::put_time
#include <ctime> // std::time_t, struct std::tm, std::localtime
#include <chrono> // std::chrono::system_clock
using namespace std;
int main() {
cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
time_t timer;
time(&timer);
cout << timer;
struct tm * ptm = localtime(&timer);
cout << put_time(ptm,"%c");
return 0;
}

Answer 1

Why not use asctime? It's prototype is char* asctime (const struct tm * timeptr); and you should not have any problem printing out he char*. The only issue is that the output format is fixed as Www Mmm dd hh:mm:ss yyyy where Www represents the three-letter abbreviation of the day of the week.
If you want more flexibility in the format of the output string, you can use strftime to get custom formatting. It's prototype is size_t strftime (char* ptr, size_t maxsize, const char* format,const struct tm* timeptr );