Parsing dates using date_input_facet accepts wrong input

[anonymous]

Hi!

I got no answer on the ML, but I consider this a bug. With the code below I try to automagically determine the date format found in input files. I'd expect the code below to find the date format "%d.%m.%Y" for "05.02.2008", but I got surprised by obtaining "%m/%d/%Y". It seems like date accepts '.' where I said "expect '/'", so I think this should be changed.

#include <boost/assign/list_of.hpp>

#include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time/gregorian/gregorian.hpp> #include <boost/date_time/local_time/local_time.hpp> #include <boost/foreach.hpp> #include <boost/algorithm/string.hpp>

#include <string> #include <list>

inline std::string determine_date_format(std::string const & s) {

using namespace boost::assign; using namespace boost::gregorian;

std::list<std::string> possible_formats = TODO: add others here!

list_of ("%Y-%m-%d")("%Y/%m/%d")("%m/%d/%Y")("%d.%m.%Y");

bool inform_user = false;

BOOST_FOREACH(std::string const & format, possible_formats) {

if (inform_user) {

std::cout << "Trying format '" << format << "' ..." << std::endl;

}

try {

date_input_facet * input_facet =

new date_input_facet(format.c_str());

std::istringstream iss(s); iss.imbue(std::locale(iss.getloc(), input_facet)); date d(not_a_date_time);

iss >> d; if (!iss.fail() && (!d.is_not_a_date())) {

return format;

}

std::cout << "WARNING: date format '" << format

<< "' does not match '" << s << "'." << std::endl;

inform_user = true;

} catch(...) { }

}

std::cout << "WARNING: date format not recognized. "

<< "Please reconfigure your measurement equipment " << "to ISO standard output!" << std::endl;

return "";

}

int main() {

std::string the_date = "05.02.2008"; std::string format = determine_date_format(the_date); std::cout << the_date << " has date-time-format "

<< format << std::endl;

return 0;

}

[anonymous]

Hello!

I can confirm the problem in boost 1.49 under debian linux.

boost