fmt
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指针指向一个空结束的图表字符串,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 E 或 O 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:
Conversion specifier
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Explanation
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Used fields
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%
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writes literal % . The full conversion specification must be %% .
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n (C++11)
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writes newline character
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t (C++11)
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writes horizontal tab character
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Year
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Y
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writes year as a 4 digit decimal number
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tm_year
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EY (C++11)
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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
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tm_year
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y
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writes last 2 digits of year as a decimal number (range [00,99] )
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tm_year
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Oy (C++11)
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writes last 2 digits of year using the alternative numeric system, e.g. 十一 instead of 11 in ja_JP locale
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tm_year
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Ey (C++11)
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writes year as offset from locale's alternative calendar period %EC (locale-dependent)
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tm_year
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C (C++11)
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writes first 2 digits of year as a decimal number (range [00,99] )
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tm_year
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EC (C++11)
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writes name of the base year (period) in the locale's alternative representation, e.g. 平成 (Heisei era) in ja_JP
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tm_year
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G (C++11)
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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:
-
-
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
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g (C++11)
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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:
-
-
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
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Month
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b
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writes abbreviated month name, e.g. Oct (locale dependent)
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tm_mon
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h (C++11)
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synonym of b
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tm_mon
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B
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writes full month name, e.g. October (locale dependent)
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tm_mon
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m
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writes month as a decimal number (range [01,12] )
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tm_mon
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Om (C++11)
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writes month using the alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale
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tm_mon
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Week
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U
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writes week of the year as a decimal number (Sunday is the first day of the week) (range [00,53] )
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tm_year , tm_wday , tm_yday
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OU (C++11)
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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
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tm_year , tm_wday , tm_yday
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W
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writes week of the year as a decimal number (Monday is the first day of the week) (range [00,53] )
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tm_year , tm_wday , tm_yday
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OW (C++11)
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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
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tm_year , tm_wday , tm_yday
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V (C++11)
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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:
-
-
包括在今年的第一个星期四 原文: Includes first Thursday of the year
|
tm_year , tm_wday , tm_yday
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OV (C++11)
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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
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tm_year , tm_wday , tm_yday
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Day of the year/month
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j
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writes day of the year as a decimal number (range [001,366] )
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tm_yday
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d
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writes day of the month as a decimal number (range [01,31] )
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tm_mday
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Od (C++11)
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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
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e (C++11)
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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
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Oe (C++11)
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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
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Day of the week
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a
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writes abbreviated weekday name, e.g. Fri (locale dependent)
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tm_wday
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A
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writes full weekday name, e.g. Friday (locale dependent)
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tm_wday
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w
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writes weekday as a decimal number, where Sunday is 0 (range [0-6] )
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tm_wday
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Ow (C++11)
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writes weekday, where Sunday is 0 , using the alternative numeric system, e.g. 二 instead of 2 in ja_JP locale
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tm_wday
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u (C++11)
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writes weekday as a decimal number, where Monday is 1 (ISO 8601 format) (range [1-7] )
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tm_wday
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Ou (C++11)
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writes weekday, where Monday is 1 , using the alternative numeric system, e.g. 二 instead of 2 in ja_JP locale
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tm_wday
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Hour, minute, second
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H
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writes hour as a decimal number, 24 hour clock (range [00-23] )
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tm_hour
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OH (C++11)
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writes hour from 24-hour clock using the alternative numeric system, e.g. 十八 instead of 18 in ja_JP locale
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tm_hour
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I
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writes hour as a decimal number, 12 hour clock (range [01,12] )
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tm_hour
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OI (C++11)
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writes hour from 12-hour clock using the alternative numeric system, e.g. 六 instead of 06 in ja_JP locale
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tm_hour
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M
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writes minute as a decimal number (range [00,59] )
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tm_min
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OM (C++11)
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writes minute using the alternative numeric system, e.g. 二十五 instead of 25 in ja_JP locale
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tm_min
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S
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writes second as a decimal number (range [00,60] )
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tm_sec
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OS (C++11)
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writes second using the alternative numeric system, e.g. 二十四 instead of 24 in ja_JP locale
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tm_sec
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Other
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c
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writes standard date and time string, e.g. Sun Oct 17 04:41:13 2010 (locale dependent)
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all
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Ec (C++11)
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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
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all
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x
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writes localized date representation (locale dependent)
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all
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Ex (C++11)
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writes alternative date representation, e.g. using 平成23年 (year Heisei 23) instead of 2011年 (year 2011) in ja_JP locale
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all
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X
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writes localized time representation (locale dependent)
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all
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EX (C++11)
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writes alternative time representation (locale dependent)
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all
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D (C++11)
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equivalent to "%m/%d/%y"
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tm_mon , tm_mday , tm_year
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F (C++11)
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equivalent to "%Y-%m-%d" (the ISO 8601 date format)
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tm_mon , tm_mday , tm_year
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r (C++11)
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writes localized 12-hour clock time (locale dependent)
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tm_hour , tm_min , tm_sec
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R (C++11)
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equivalent to "%H:%M"
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tm_hour , tm_min
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T (C++11)
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equivalent to "%H:%M:%S" (the ISO 8601 time format)
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tm_hour , tm_min , tm_sec
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p
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writes localized a.m. or p.m. (locale dependent)
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tm_hour
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z (C++11)
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writes offset from UTC in the ISO 8601 format (e.g. -0430 ), or no characters if the time zone information is not available
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tm_isdst
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Z
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writes time zone name or abbreviation, or no characters if the time zone information is not available (locale dependent)
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tm_isdst
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原文: pointer to a null-terminated CharT 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 E 或 O 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:
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
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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)
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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)
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writes year as offset from locale's alternative calendar period %EC (locale-dependent)
|
tm_year
|
C (C++11)
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writes first 2 digits of year as a decimal number (range [00,99] )
|
tm_year
|
EC (C++11)
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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)
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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:
-
-
包括在今年的第一个星期四 原文: 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] ).
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:
-
-
包括在今年的第一个星期四 原文: 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)
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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
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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)
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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:
-
-
包括在今年的第一个星期四 原文: 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. 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.
|
tm_mday
|
e (C++11)
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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.
|
tm_mday
|
Oe (C++11)
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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.
|
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
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writes minute as a decimal number (range [00,59] )
|
tm_min
|
OM (C++11)
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writes minute using the alternative numeric system, e.g. 二十五 instead of 25 in ja_JP locale
|
tm_min
|
S
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writes second as a decimal number (range [00,60] )
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tm_sec
|
OS (C++11)
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writes second using the alternative numeric system, e.g. 二十四 instead of 24 in ja_JP locale
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tm_sec
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Other
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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
|
|