Difference between revisions of "cpp/io/manip/put time"
From cppreference.com
m (fmt) |
m (+ link to the format string table) |
||
| Line 11: | Line 11: | ||
{{par begin}} | {{par begin}} | ||
{{par | tmb | pointer to the calendar time structure as obtained from {{lc|std::localtime}} or {{lc|std::gmtime}}}} | {{par | tmb | pointer to the calendar time structure as obtained from {{lc|std::localtime}} or {{lc|std::gmtime}}}} | ||
| − | {{par | fmt | pointer to a null-terminated {{tt|CharT}} string specifying the format of conversion (see the table below)}} | + | {{par | fmt | pointer to a null-terminated {{tt|CharT}} string specifying the format of conversion (see the [[#Format string|table]] below)}} |
{{par end}} | {{par end}} | ||
Revision as of 00:24, 26 July 2021
| Defined in header <iomanip>
|
||
| template< class CharT > /*unspecified*/ put_time( const std::tm* tmb, const CharT* fmt ); |
(since C++11) | |
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.
Contents |
Parameters
| tmb | - | pointer to the calendar time structure as obtained from std::localtime or std::gmtime |
| fmt | - | pointer to a null-terminated CharT string specifying the format of conversion (see the table below)
|
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:
| 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.平成23年 (year Heisei 23) instead of 2011年 (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. 十一 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. 平成 (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:
|
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:
|
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. 十二 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. 五十二 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. 五十二 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:
|
tm_year, tm_wday, tm_yday
|
OV(C++11) |
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
|
| 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. 二十七 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. 二十七 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. 二 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. 二 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. 十八 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. 六 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. 二十五 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. 二十四 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 平成23年 (year Heisei 23) instead of 2011年 (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 平成23年 (year Heisei 23) instead of 2011年 (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
|
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
See also
| formats contents of std::tm for output as character sequence (class template) | |
| (C++11) |
parses a date/time value of specified format (function template) |
| converts a std::tm object to custom textual representation (function) | |
| converts a std::tm object to custom wide string textual representation (function) |
