Re: [Boost-users] time date newbie problem

From: Jeff Garland (jeff_at_[hidden])
Date: 2007-12-26 13:24:44

Micha³ Nowotka wrote:
> Hi,
> I'm a date time library newbie and currenty working on simple web
> server implementation in C++. I want to generate string containing
> actual date in following format:
> 
> Wed, 26 Dec 2007 17:33:47 GMT
> 
> Date time documentation is so complicated and I can't find clear
> answer how to do that. Can you help me?
> 

Yes, it's trivial, uses format flags like strftime -- see this doc page for more:

http://www.boost.org/doc/html/date_time/date_time_io.html

But here's some example code:

#include "boost/date_time.hpp"
#include <iostream>

using namespace boost::posix_time;
using namespace boost::gregorian;

int main()
{

   ptime t1(date(2007, Dec, 26), hours(1) + seconds(5) + milliseconds(9));

   time_facet* timefacet = new time_facet("%a, %d %b %Y %H:%M:%S %z");
   std::cout.imbue(std::locale(std::locale::classic(), timefacet));

   std::cout << t1 << std::endl; //Wed, 26 Dec 2007 01:00:05
}

Only thing to note there is that this doesn't output a timezone because the 
ptime type doesn't carry timezone data with it.  To get the full timezone 
behavior you'll need to look up boost::local_time::local_date_time and the 
boost::local_time::local_time_facet.  I trust you can look those up in the docs.

Jeff