std::put_time (3) - Linux Manuals

std::put_time: std::put_time

NAME

std::put_time - std::put_time

Synopsis

Defined in header <iomanip>
template< class CharT > (since C++11)
/*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

tmb - pointer to the calendar time structure as obtained from std::localtime or std::gmtime
      pointer to a null-terminated CharT string specifying the format of conversion.
      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:

      Conversion Explanation Used fields
      specifier
      % writes literal %. The full conversion specification must be %%.
      n writes newline character
      (C++11)
      t writes horizontal tab character
      (C++11)
      Year
      Y writes year as a decimal number, e.g. 2017 tm_year
      EY writes year in the alternative representation, e.g.平成23年 (year Heisei 23) instead of 2011年 (year 2011) in ja_JP loctm_year
      (C++11)
      y writes last 2 digits of year as a decimal number (range [00,99]) tm_year
      Oy writes last 2 digits of year using the alternative numeric system, e.g. 十一 instead of 11 in ja_JP locale tm_year
      (C++11)
      Ey writes year as offset from locale's alternative calendar period %EC (locale-dependent) tm_year
      (C++11)
      C writes first 2 digits of year as a decimal number (range [00,99]) tm_year
      (C++11)
      EC writes name of the base year (period) in the locale's alternative representation, e.g. 平成 (Heisei era) in ja_JP tm_year
      (C++11)
                 writes ISO 8601 week-based year, i.e. the year that contains the specified week.
                 In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
      G tm_year, tm_wday, tm_yday
      (C++11) * Includes January 4
                 * Includes first Thursday of the year

                 writes last 2 digits of ISO 8601 week-based year, i.e. the year that contains the specified week (range [00,99]).
                 In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
      g tm_year, tm_wday, tm_yday
      (C++11) * Includes January 4
                 * Includes first Thursday of the year

      Month
      b writes abbreviated month name, e.g. Oct (locale dependent) tm_mon
      h synonym of b tm_mon
      (C++11)
      B writes full month name, e.g. October (locale dependent) tm_mon
      m writes month as a decimal number (range [01,12]) tm_mon
      Om writes month using the alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale tm_mon
      (C++11)
      Week
      U writes week of the year as a decimal number (Sunday is the first day of the week) (range [00,53]) tm_year, tm_wday, tm_yday
      OU writes week of the year, as by %U, using the alternative numeric system, e.g. 五十二 instead of 52 in ja_JP locale tm_year, tm_wday, tm_yday
      (C++11)
      W writes week of the year as a decimal number (Monday is the first day of the week) (range [00,53]) tm_year, tm_wday, tm_yday
      OW writes week of the year, as by %W, using the alternative numeric system, e.g. 五十二 instead of 52 in ja_JP locale tm_year, tm_wday, tm_yday
      (C++11)
                 writes ISO 8601 week of the year (range [01,53]).
                 In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
      V tm_year, tm_wday, tm_yday
      (C++11) * Includes January 4
                 * Includes first Thursday of the year

      OV writes week of the year, as by %V, using the alternative numeric system, e.g. 五十二 instead of 52 in ja_JP locale tm_year, tm_wday, tm_yday
fmt - (C++11)
      Day of the year/month
      j writes day of the year as a decimal number (range [001,366]) tm_yday
      d writes day of the month as a decimal number (range [01,31]) tm_mday
      Od writes zero-based day of the month using the alternative numeric system, e.g 二十七 instead of 27 in ja_JP locale tm_mday
      (C++11) Single character is preceded by a space.
      e writes day of the month as a decimal number (range [1,31]). tm_mday
      (C++11) Single digit is preceded by a space.
      Oe writes one-based day of the month using the alternative numeric system, e.g. 二十七 instead of 27 in ja_JP locale tm_mday
      (C++11) Single character is preceded by a space.
      Day of the week
      a writes abbreviated weekday name, e.g. Fri (locale dependent) tm_wday
      A writes full weekday name, e.g. Friday (locale dependent) tm_wday
      w writes weekday as a decimal number, where Sunday is 0 (range [0-6]) tm_wday
      Ow writes weekday, where Sunday is 0, using the alternative numeric system, e.g. 二 instead of 2 in ja_JP locale tm_wday
      (C++11)
      u writes weekday as a decimal number, where Monday is 1 (ISO 8601 format) (range [1-7]) tm_wday
      (C++11)
      Ou writes weekday, where Monday is 1, using the alternative numeric system, e.g. 二 instead of 2 in ja_JP locale tm_wday
      (C++11)
      Hour, minute, second
      H writes hour as a decimal number, 24 hour clock (range [00-23]) tm_hour
      OH writes hour from 24-hour clock using the alternative numeric system, e.g. 十八 instead of 18 in ja_JP locale tm_hour
      (C++11)
      I writes hour as a decimal number, 12 hour clock (range [01,12]) tm_hour
      OI writes hour from 12-hour clock using the alternative numeric system, e.g. 六 instead of 06 in ja_JP locale tm_hour
      (C++11)
      M writes minute as a decimal number (range [00,59]) tm_min
      OM writes minute using the alternative numeric system, e.g. 二十五 instead of 25 in ja_JP locale tm_min
      (C++11)
      S writes second as a decimal number (range [00,60]) tm_sec
      OS writes second using the alternative numeric system, e.g. 二十四 instead of 24 in ja_JP locale tm_sec
      (C++11)

Other

      c writes standard date and time string, e.g. Sun Oct 17 04:41:13 2010 (locale dependent) all
      Ec writes alternative date and time string, e.g. using 平成23年 (year Heisei 23) instead of 2011年 (year 2011) in ja_JP loalle
      (C++11)
      x writes localized date representation (locale dependent) all
      Ex writes alternative date representation, e.g. using 平成23年 (year Heisei 23) instead of 2011年 (year 2011) in ja_JP locall
      (C++11)
      X writes localized time representation (locale dependent) all
      EX writes alternative time representation (locale dependent) all
      (C++11)
      D equivalent to "%m/%d/%y" tm_mon, tm_mday, tm_year
      (C++11)
      F equivalent to "%Y-%m-%d" (the ISO 8601 date format) tm_mon, tm_mday, tm_year
      (C++11)
      r writes localized 12-hour clock time (locale dependent) tm_hour, tm_min, tm_sec
      (C++11)
      R equivalent to "%H:%M" tm_hour, tm_min
      (C++11)
      T equivalent to "%H:%M:%S" (the ISO 8601 time format) tm_hour, tm_min, tm_sec
      (C++11)
      p writes localized a.m. or p.m. (locale dependent) tm_hour
      z writes offset from UTC in the ISO 8601 format (e.g. -0430), or no characters if the time zone information is not available tm_isdst
      (C++11)
      Z writes locale-dependent time zone name or abbreviation, or no characters if the time zone information is not available tm_isdst

Return value

Returns an object of unspecified type such that if out is the name of an output stream of type std::basic_ostream<CharT, Traits>, then the expression out << put_time(tmb, fmt) behaves as if the following code was executed:
typedef std::ostreambuf_iterator<CharT, Traits> Iter;
typedef std::time_put<CharT, Iter> TimePut;
const TimePut& tp = std::use_facet<TimePut>(out.getloc());
const Iter end = tp.put(Iter(out.rdbuf()), out, out.fill(), tmb, fmt, fmt + Traits::length(fmt));
if (end.failed())
out.setstate(std::ios_base::badbit);

Example

// Run this code

  #include <iostream>
  #include <iomanip>
  #include <ctime>

  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';
  }

Output:

  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