std::time_get<CharT,InputIt>::get_date, std::time_get<CharT,InputIt>::do_get_date

Header: <locale>

Public member function, calls the protected virtual member function do_get_date of the most derived class.

# Declarations

public:
iter_type get_date( iter_type beg, iter_type end, std::ios_base& str,
std::ios_base::iostate& err, std::tm* t ) const;

protected:
virtual iter_type do_get_date( iter_type beg, iter_type end, std::ios_base& str,
std::ios_base::iostate& err, std::tm* t ) const;

# Parameters

beg: iterator designating the start of the sequence to parse
end: one past the end iterator for the sequence to parse
str: a stream object that this function uses to obtain locale facets when needed, e.g. std::ctype to skip whitespace or std::collate to compare strings
err: stream error flags object that is modified by this function to indicate errors
t: pointer to the std::tm object that will hold the result of this function call

# Return value

Iterator pointing one past the last character in [beg,end) that was recognized as a part of a valid date.

# Notes

For the alphabetic components of the default date format (if any), this function is usually case-insensitive.

If a parsing error is encountered, most implementations of this function leave *t unmodified.

The implementation may support other date formats besides the ones required by the standard.

# Example

#include <ctime>
#include <iostream>
#include <iterator>
#include <locale>
#include <sstream>
 
void try_get_date(const std::string& s)
{
    std::cout << "Parsing the date out of '" << s
              << "' in the locale " << std::locale().name() << '\n';
    std::istringstream str(s);
    std::ios_base::iostate err = std::ios_base::goodbit;
 
    std::tm t;
    const std::time_get<char>& facet = std::use_facet<std::time_get<char>>(str.getloc());
    std::istreambuf_iterator<char> ret = facet.get_date({str}, {}, str, err, &t);
    str.setstate(err);
 
    if (str)
    {
        std::cout << "Day: " << t.tm_mday << ' '
                  << "Month: " << t.tm_mon + 1 << ' '
                  << "Year: " << t.tm_year + 1900 << '\n';
    }
    else
    {
        std::cout << "Parse failed. Unparsed string: ";
        std::copy(ret, {}, std::ostreambuf_iterator<char>(std::cout));
        std::cout << '\n';
    }
}
int main()
{
    std::locale::global(std::locale("en_US.utf8"));
    try_get_date("02/01/2013");
    try_get_date("02-01-2013");
 
    std::locale::global(std::locale("ja_JP.utf8"));
    try_get_date("2013年02月01日");
}

# Defect reports

DR	Applied to	Behavior as published	Correct behavior
LWG 248	C++98	eofbit was not set upon reaching the end iterator	sets eofbit if a valid date has not been read
LWG 461	C++98	do_get_date needed to parse localized date representation	parses with the format determined by date_order()

# See also

get_time