I'm having trouble converting a ptime object from boost into a string to be passed in to a function. I have found multiple similar other threads in regards to outputing a boost time object to a string (mostly to cout) but none of what I've found on them are working. 

It appears the easiest way is inserting the ptime object into a stringstream and then using the stringstream's string. I have also attempted to imbue the stringstream with a time\_facet, as some of the answers on other threads suggest. However, I am unable to create a time\_facet object. It gives me the error that the argument list for the class template is missing. What is confusing is the nowhere on the internet have I found any mention of an argument list for time\_facet, and even boost's documentation page shows that the default constructor for a time\_facet is merely time\_facet().

Below is a simple version of what I have tried:

```
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/posix_time/posix_time_io.hpp>

boost::posix_time::ptime time = boost::posix_time::time_from_string("1981-08-20 08:05:00"); 
std::stringstream sstream;
sstream << time;
_updateStatement->setString(1, (sql::SQLString)sstream.str());

```

The insertion of time into the stringstream gives me a bunch of compilation errors in the vein of 

```
error C2220: warning treated as error - no 'object' file generated C:\code\trunk\Development\External\boost\include\boost/date_time/time_facet.hpp(247) :while compiling class template member function 'boost::date_time::time_facet<time_type,CharT>::time_facet(size_t)'
          with
          [
              time_type=boost::posix_time::ptime,
              CharT=char
          ]

```

despite the fact that I haven't used any time\_facet objects.

When I DO try to do this with a time\_facet object, I add in 

```
sstream.imbue(std::locale(sstream.getloc(), new boost::date_time::time_facet("%Y-%m-%d %H:%M:%S")));

```

before inserting the time into the stringstream. The errors for that are that it wants an argument list as mentioned at the top of this post.

Is there perhaps a function in boost that is the reverse of boost::posix\_time::time\_from\_string()? If not, any other help would be appreciated. Thank you.