How to format date time object with format dd/mm/yyyy?

Question

How could I print the current date, using Boost libraries, in the format dd/mm/yyyy H?

What I have:

boost::posix_time::ptime now = boost::posix_time::second_clock::local_time(); cout << boost::posix_time::to_simple_string(now).c_str();  2009-Dec-14 23:31:40 

But I want:

14-Dec-2009 23:31:40

Answer 1

If you're using Boost.Date_Time, this is done using IO facets.

You need to include boost/date_time/posix_time/posix_time_io.hpp to get the correct facet typedefs (wtime_facet, time_facet, etc.) for boost::posix_time::ptime. Once this is done, the code is pretty simple. You call imbue on the ostream you want to output to, then just output your ptime:

#include <iostream> #include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/posix_time/posix_time_io.hpp>  using namespace boost::posix_time; using namespace std;  int main(int argc, char **argv) {   time_facet *facet = new time_facet("%d-%b-%Y %H:%M:%S");   cout.imbue(locale(cout.getloc(), facet));   cout << second_clock::local_time() << endl; } 

Output:

14-Dec-2009 16:13:14 

See also the list of format flags in the boost docs, in case you want to output something fancier.