std::put_time

template< class CharT >
/*unspecified*/ put_time( const std::tm* tmb, const CharT* fmt );

When used in an expression out << put_time(tmb, fmt), converts the date and time information from a given calendar time tmb to a character string according to format string fmt, as if by calling std::strftime, std::wcsftime, or analog (depending on CharT), according to the std::time_put facet of the locale currently imbued in the output stream out.

Parameters

Format string

The format string consists of zero or more conversion specifiers and ordinary characters (except %). All ordinary characters, including the terminating null character, are copied to the output string without modification. Each conversion specification begins with % character, optionally followed by E or O modifier (ignored if unsupported by the locale), followed by the character that determines the behavior of the specifier. The following format specifiers are available:

Return value

An object of unspecified type such that

• if out is an object of type std::basic_ostream<CharT, Traits>, the expression out << put_time(tmb, fmt)
  • has type std::basic_ostream<CharT, Traits>&
  • has value out
  • behaves as if it called f(out, tmb, fmt)

where the function f is defined as:

template<class CharT, class Traits>
void f(std::basic_ios<CharT, Traits>& str, const std::tm* tmb, const CharT* fmt)
{
    using Iter = std::ostreambuf_iterator<CharT, Traits>;
    using TimePut = std::time_put<CharT, Iter>;
 
    const TimePut& tp = std::use_facet<TimePut>(str.getloc());
    const Iter end = tp.put(Iter(str.rdbuf()), str, str.fill(), tmb,
        fmt, fmt + Traits::length(fmt));
 
    if (end.failed())
        str.setstate(std::ios_base::badbit);
}

Example

#include <ctime>
#include <iomanip>
#include <iostream>
 
int main()
{
    std::time_t t = std::time(nullptr);
    std::tm tm = *std::localtime(&t);
 
    std::cout.imbue(std::locale("ru_RU.utf8"));
    std::cout << "ru_RU: " << std::put_time(&tm, "%c %Z") << '\n';
 
    std::cout.imbue(std::locale("ja_JP.utf8"));
    std::cout << "ja_JP: " << std::put_time(&tm, "%c %Z") << '\n';
}

ru_RU: Ср. 28 дек. 2011 10:21:16 EST
ja_JP: 2011年12月28日 10時21分16秒 EST

See also