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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/io/manip/put_time.html below:

std::put_time - cppreference.com

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.

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
specifier Explanation Used fields % writes literal %. The full conversion specification must be %%. n
(C++11) writes newline character t
(C++11) writes horizontal tab character Year Y writes year as a decimal number, e.g. 2017 tm_year EY
(C++11) writes year in the alternative representation, e.g.å¹³æ23å¹´ (year Heisei 23) instead of 2011å¹´ (year 2011) in ja_JP locale tm_year y writes last 2 digits of year as a decimal number (range [00,99]) tm_year Oy
(C++11) writes last 2 digits of year using the alternative numeric system, e.g. åä¸ instead of 11 in ja_JP locale tm_year Ey
(C++11) writes year as offset from locale's alternative calendar period %EC (locale-dependent) tm_year C
(C++11) writes first 2 digits of year as a decimal number (range [00,99]) tm_year EC
(C++11) writes name of the base year (period) in the locale's alternative representation, e.g. å¹³æ (Heisei era) in ja_JP tm_year G
(C++11) writes ISO 8601 week-based year, i.e. the year that contains the specified week.

In ISO 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:

Includes January 4
Includes first Thursday of the year

tm_year, tm_wday, tm_yday g
(C++11) writes last 2 digits of ISO 8601 week-based year, i.e. the year that contains the specified week (range [00,99]).

In ISO 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:

Includes January 4
Includes first Thursday of the year

tm_year, tm_wday, tm_yday Month b writes abbreviated month name, e.g. Oct (locale dependent) tm_mon h
(C++11) synonym of b tm_mon 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
(C++11) writes month using the alternative numeric system, e.g. åäº instead of 12 in ja_JP locale tm_mon 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
(C++11) writes week of the year, as by %U, using the alternative numeric system, e.g. äºåäº instead of 52 in ja_JP locale tm_year, tm_wday, tm_yday 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
(C++11) writes week of the year, as by %W, using the alternative numeric system, e.g. äºåäº instead of 52 in ja_JP locale tm_year, tm_wday, tm_yday V
(C++11) writes ISO 8601 week of the year (range [01,53]).

In ISO 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:

Includes January 4
Includes first Thursday of the year

tm_year, tm_wday, tm_yday OV
(C++11) writes week of the year, as by %V, using the alternative numeric system, e.g. äºåäº instead of 52 in ja_JP locale tm_year, tm_wday, tm_yday 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
(C++11) writes zero-based day of the month using the alternative numeric system, e.g. äºåä¸ instead of 27 in ja_JP locale

Single character is preceded by a space.

tm_mday e
(C++11) writes day of the month as a decimal number (range [1,31]).

Single digit is preceded by a space.

tm_mday Oe
(C++11) writes one-based day of the month using the alternative numeric system, e.g. äºåä¸ instead of 27 in ja_JP locale

Single character is preceded by a space.

tm_mday 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
(C++11) writes weekday, where Sunday is 0, using the alternative numeric system, e.g. äº instead of 2 in ja_JP locale tm_wday u
(C++11) writes weekday as a decimal number, where Monday is 1 (ISO 8601 format) (range [1-7]) tm_wday Ou
(C++11) writes weekday, where Monday is 1, using the alternative numeric system, e.g. äº instead of 2 in ja_JP locale tm_wday Hour, minute, second H writes hour as a decimal number, 24 hour clock (range [00-23]) tm_hour OH
(C++11) writes hour from 24-hour clock using the alternative numeric system, e.g. åå« instead of 18 in ja_JP locale tm_hour I writes hour as a decimal number, 12 hour clock (range [01,12]) tm_hour OI
(C++11) writes hour from 12-hour clock using the alternative numeric system, e.g. å instead of 06 in ja_JP locale tm_hour M writes minute as a decimal number (range [00,59]) tm_min OM
(C++11) writes minute using the alternative numeric system, e.g. äºåäº instead of 25 in ja_JP locale tm_min S writes second as a decimal number (range [00,60]) tm_sec OS
(C++11) writes second using the alternative numeric system, e.g. äºåå instead of 24 in ja_JP locale tm_sec Other c writes standard date and time string, e.g. Sun Oct 17 04:41:13 2010 (locale dependent) all Ec
(C++11) writes alternative date and time string, e.g. using å¹³æ23å¹´ (year Heisei 23) instead of 2011å¹´ (year 2011) in ja_JP locale all x writes localized date representation (locale dependent) all Ex
(C++11) writes alternative date representation, e.g. using å¹³æ23å¹´ (year Heisei 23) instead of 2011å¹´ (year 2011) in ja_JP locale all X writes localized time representation, e.g. 18:40:20 or 6:40:20 PM (locale dependent) all EX
(C++11) writes alternative time representation (locale dependent) all D
(C++11) equivalent to "%m/%d/%y" tm_mon, tm_mday, tm_year F
(C++11) equivalent to "%Y-%m-%d" (the ISO 8601 date format) tm_mon, tm_mday, tm_year r
(C++11) writes localized 12-hour clock time (locale dependent) tm_hour, tm_min, tm_sec R
(C++11) equivalent to "%H:%M" tm_hour, tm_min T
(C++11) equivalent to "%H:%M:%S" (the ISO 8601 time format) tm_hour, tm_min, tm_sec p writes localized a.m. or p.m. (locale dependent) tm_hour z
(C++11) 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 Z writes locale-dependent time zone name or abbreviation, or no characters if the time zone information is not available tm_isdst

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);
}

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