I tried the below code:

#include <boost/date_time.hpp>
#include <boost/date_time/posix_time/ptime.hpp>

#include <iostream>
using namespace boost::posix_time;

int main()
{
    std::string _format1 = "%Y-%m-%d %H:%M:%S";
    std::string _format2 = "%Y-%m-%e %H:%M:%S";

    std::string teststring = "2010-09-10 10:01:01";
    ptime time1, time2;

    time_input_facet facet1(_format1, 1);
    time_input_facet facet2(_format2, 1);

    std::stringstream ss1(teststring);
    std::stringstream ss2(teststring);

    ss1.imbue(std::locale(ss1.getloc(), &facet1));
    ss1 >> time1;

    ss2.imbue(std::locale(ss2.getloc(), &facet2));
    ss2 >> time2;

    std::cout << "Time1: " << time1 << std::endl;
    std::cout << "Time2: " << time2 << std::endl;
    return 0;
}

The output is:

Time1: 2010-Sep-10 10:01:01
Time2: not-a-date-time

Who can help to fix the issue for the format using "%e"?

Thanks in advance!