Use date facets to parse more string format defined by the ISO. Taken from http://boost.2283326.n4.nabble.com/ptime-from-iso-string-amp-time-from-string-td2566283.html

ExtendedDateParsingInBoost.cpp

// Instead of this
std::string s("19991217T151515"); 
ptime t = from_iso_string(s); 
std::cout << t << std::endl; 



// Use this
time_input_facet* input_facet = new time_input_facet(); 
input_facet->set_iso_extended_format(); 

std::stringstream ss; 
ss.imbue(std::locale(ss.getloc(), input_facet)); 
ss.str("1999-12-17T15:15:15"); 
ptime t1; 
ss >> t1;