Is there a simple way to turn a tm structure into a Glib::DateTime object ?

[John Emmas <john creativepost co uk>]

Suppose I've initialized a tm struct somehow:-

      #include <time.h>
      struct tm date_and_time;
      initialize_date_and_time_somehow (&date_and_time);

Is there a simple way to turn that data into a Glib::DateTime object?  I 
assume I could do something like this:-

      Glib::DateTime tm ( g_date_time_new ( g_time_zone_new (),
                date_and_time.tm_year,   date_and_time.tm_mon ,
                date_and_time.tm_mday,  date_and_time.tm_hour ,
                date_and_time.tm_min,    date_and_time.tm_sec ));

but it all seems a bit convoluted...  Have I missed something a lot 
simpler?  Thanks,

John