std::wcsftime

来自cppreference.com
< cpp‎ | chrono‎ | c

 
 
实用工具库
类型的支持 (basic types, RTTI, type traits)
动态内存管理
错误处理
程序实用工具
可变参数函数
日期和时间
函数对象
initializer_list(C++11)
bitset
hash(C++11)
关系运算符
原文:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
双和元组
原文:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
掉期,远期和移动
原文:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
 
C-风格的日期和时间工具
功能
原文:
Functions
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时间操作
原文:
Time manipulation
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difftime
time
clock
格式转换
原文:
Format conversions
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asctime
ctime
strftime
wcsftime
gmtime
localtime
mktime
常量
原文:
Constants
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CLOCKS_PER_SEC
类型
原文:
Types
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tm
time_t
clock_t
 
在头文件 <cwchar> 中定义
std::size_t wcsftime( wchar_t* str, std::size_t count, const wchar_t* format, std::tm* time );
转换的日期和时间信息从一个给定的日历时间timenull结尾的宽字符的字符串str根据格式字符串format的。 count字节写的
原文:
Converts the date and time information from a given calendar time time to a null-terminated wide character string str according to format string format. Up to count bytes are written.
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目录

[编辑] 参数

str -
指针wchar_t的阵列的输出的第一个元素
原文:
pointer to the first element of the wchar_t array for output
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count -
宽字符写入的最大数量
原文:
maximum number of wide characters to write
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format -
指针指向一个空结尾的宽字符的字符串,该字符串指定的格式转换。
格式字符串由零个或多个转换符和普通字符(除%)。所有普通字符,包括终止空字符,不加修改地复制到输出字符串。每个转换规格%字符开始,后面可以跟EO的修饰符(被忽略,如果不支持的语言环境),其次的性格,决定了行为的说明。下面的格式说明符
原文:
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:
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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 4 digit decimal number 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.
在IS0 8601周(星期一)开始,并在今年的第一周必须满足下列要求:
原文:
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
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  • 包括1月4日
    原文:
    Includes January 4
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  • 包括在今年的第一个星期四
    原文:
    Includes first Thursday of the year
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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]).
在IS0 8601周(星期一)开始,并在今年的第一周必须满足下列要求:
原文:
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
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  • 包括1月4日
    原文:
    Includes January 4
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  • 包括在今年的第一个星期四
    原文:
    Includes first Thursday of the year
    这段文字是通过 Google Translate 自动翻译生成的。
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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]).
在IS0 8601周(星期一)开始,并在今年的第一周必须满足下列要求:
原文:
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
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  • 包括1月4日
    原文:
    Includes January 4
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  • 包括在今年的第一个星期四
    原文:
    Includes first Thursday of the year
    这段文字是通过 Google Translate 自动翻译生成的。
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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 23 in ja_JP locale
单字符前面的空间.
原文:
Single character is preceded by a space.
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tm_mday
e(C++11) writes day of the month as a decimal number (range [1,31]).
单数字前会加上一个空格.
原文:
Single digit is preceded by a space.
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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
单字符前面的空间.
原文:
Single character is preceded by a space.
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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 (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 time zone name or abbreviation, or no characters if the time zone information is not available (locale dependent) tm_isdst
原文:
pointer to a null-terminated wide character string specifying the format of conversion.
格式字符串由零个或多个转换符和普通字符(除%)。所有普通字符,包括终止空字符,不加修改地复制到输出字符串。每个转换规格%字符开始,后面可以跟EO的修饰符(被忽略,如果不支持的语言环境),其次的性格,决定了行为的说明。下面的格式说明符
原文:
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:
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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 4 digit decimal number 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.
在IS0 8601周(星期一)开始,并在今年的第一周必须满足下列要求:
原文:
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
这段文字是通过 Google Translate 自动翻译生成的。
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  • 包括1月4日
    原文:
    Includes January 4
    这段文字是通过 Google Translate 自动翻译生成的。
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  • 包括在今年的第一个星期四
    原文:
    Includes first Thursday of the year
    这段文字是通过 Google Translate 自动翻译生成的。
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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]).
在IS0 8601周(星期一)开始,并在今年的第一周必须满足下列要求:
原文:
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
这段文字是通过 Google Translate 自动翻译生成的。
您可以帮助我们检查、纠正翻译中的错误。详情请点击这里
  • 包括1月4日
    原文:
    Includes January 4
    这段文字是通过 Google Translate 自动翻译生成的。
    您可以帮助我们检查、纠正翻译中的错误。详情请点击这里
  • 包括在今年的第一个星期四
    原文:
    Includes first Thursday of the year
    这段文字是通过 Google Translate 自动翻译生成的。
    您可以帮助我们检查、纠正翻译中的错误。详情请点击这里
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]).
在IS0 8601周(星期一)开始,并在今年的第一周必须满足下列要求:
原文:
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
这段文字是通过 Google Translate 自动翻译生成的。
您可以帮助我们检查、纠正翻译中的错误。详情请点击这里
  • 包括1月4日
    原文:
    Includes January 4
    这段文字是通过 Google Translate 自动翻译生成的。
    您可以帮助我们检查、纠正翻译中的错误。详情请点击这里
  • 包括在今年的第一个星期四
    原文:
    Includes first Thursday of the year
    这段文字是通过 Google Translate 自动翻译生成的。
    您可以帮助我们检查、纠正翻译中的错误。详情请点击这里
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 23 in ja_JP locale
单字符前面的空间.
原文:
Single character is preceded by a space.
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tm_mday
e(C++11) writes day of the month as a decimal number (range [1,31]).
单数字前会加上一个空格.
原文:
Single digit is preceded by a space.
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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
单字符前面的空间.
原文:
Single character is preceded by a space.
这段文字是通过 Google Translate 自动翻译生成的。
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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 (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 time zone name or abbreviation, or no characters if the time zone information is not available (locale dependent) tm_isdst
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[编辑] 返回值

str不包括终止L'\0'成功的宽字符宽字符数组写入数。 count之前达成的整个字符串可以存储,0返回的内容是不确定的.....
原文:
Number of wide characters written into the wide character array pointed to by str not including the terminating L'\0' on success. If count was reached before the entire string could be stored, 0 is returned and the contents are undefined.
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[编辑] 为例

#include <ctime>
#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
    std::locale::global(std::locale("ja_JP.utf8"));
    std::time_t t = std::time(NULL);
    wchar_t wstr[100];
    if(std::wcsftime(wstr, 100, L"%A %c", std::localtime(&t))) {
        std::wcout << wstr << '\n';
    }
}

输出:

火曜日 2011年12月27日 17時43分13秒

[编辑] 另请参阅

tm对象转换成自定义的文字表述
原文:
converts a tm object to custom textual representation
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(函数) [edit]
(C++11)
格式和输出的日期/时间值,按指定的格式
原文:
formats and outputs a date/time value according to the specified format
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(函数模板) [edit]
C documentation for wcsftime