php中strftime函数的使用方法

定义和用法

strftime() 函数根据区域设置格式化本地时间／日期。

语法

strftime(format,timestamp)参数 描述
format 可选。规定如何返回结果。
timestamp 可选。
提示和注释
提示：与 gmstrftime() 的行为相同，不同的是返回时间是本地时间。

例子

输出 strftime() 和 gmstrftime() 的结果：

 ?html' target='_blank'>php教程echo(strftime( %b %d %Y %X , mktime(20,0,0,12,31,98)));echo(gmstrftime( %b %d %Y %X , mktime(20,0,0,12,31,98)));//输出当前日期、时间和时区echo(gmstrftime( It is %a on %b %d, %Y, %X time zone: %Z ,time()));? 

strftime()函数可以把YYYY-MM-DD HH:MM:SS格式的日期字符串转换成其它形式的字符串。
strftime()的语法是strftime(格式, 日期/时间, 修正符, 修正符, ...)

它可以用以下的符号对日期和时间进行格式化：

这个参数的最大长度是 1023 个字符。

Warning
尽管 ISO 9889:1999（当前的 C 标准）明确指出一周从星期一开始，但是 Sun Solaris 的一周似乎从星期天开始并作为 1。所以 %u 的结果也许不会和手册里描述得一样。

Warning
仅针对 Windows：这个函数里 %e 修饰符修饰符还不能支持 Windows。 为了得到这个值可以用 %#d 修饰符来代替。下例说明了如何写一个跨平台支持的函数。

Warning
仅针对 Mac OS X：这个函数里 %P 修饰符还不能支持 Mac OS X。

timestamp
可选的 timestamp 参数是一个 integer 的 Unix 时间戳，如未指定，参数值默认为当前本地时间。也就是说，其值默认为 time() 的返回值。

strftime()的用法举例如下：

select strftime( %Y.%m.%d %H:%M:%S , now , localtime
结果：2018.06.21 21:41:09
其实更好的用法是这样的,比如统,本月或本年的支出:
select strftime( %Y-%m ,日期) as 月份,sum(支出) as 月支出 from 流水帐 group by 月份;

Example #1 strftime() locale examples

 ?phpsetlocale(LC_TIME, C echo strftime( %A setlocale(LC_TIME, fi_FI echo strftime( in Finnish is %A, setlocale(LC_TIME, fr_FR echo strftime( in French %A and setlocale(LC_TIME, de_DE echo strftime( in German %A./n ? 

Example #2 ISO 8601:1988 week number example

 ?php/* December 2002 / January 2003ISOWk M Tu W Thu F Sa Su----- ----------------------------51 16 17 18 19 20 21 2252 23 24 25 26 27 28 291 30 31 1 2 3 4 52 6 7 8 9 10 11 123 13 14 15 16 17 18 19 */// Outputs: 12/28/2002 - %V,%G,%Y = 52,2002,2002echo 12/28/2002 - %V,%G,%Y = . strftime( %V,%G,%Y , strtotime( 12/28/2002 )) . /n // Outputs: 12/30/2002 - %V,%G,%Y = 1,2003,2002echo 12/30/2002 - %V,%G,%Y = . strftime( %V,%G,%Y , strtotime( 12/30/2002 )) . /n // Outputs: 1/3/2003 - %V,%G,%Y = 1,2003,2003echo 1/3/2003 - %V,%G,%Y = . strftime( %V,%G,%Y ,strtotime( 1/3/2003 )) . /n // Outputs: 1/10/2003 - %V,%G,%Y = 2,2003,2003echo 1/10/2003 - %V,%G,%Y = . strftime( %V,%G,%Y ,strtotime( 1/10/2003 )) . /n 
// Outputs: 12/23/2004 - %V,%G,%Y = 52,2004,2004echo 12/23/2004 - %V,%G,%Y = . strftime( %V,%G,%Y ,strtotime( 12/23/2004 )) . /n // Outputs: 12/31/2004 - %V,%G,%Y = 53,2004,2004echo 12/31/2004 - %V,%G,%Y = . strftime( %V,%G,%Y ,strtotime( 12/31/2004 )) . /n // Outputs: 1/2/2005 - %V,%G,%Y = 53,2004,2005echo 1/2/2005 - %V,%G,%Y = . strftime( %V,%G,%Y ,strtotime( 1/2/2005 )) . /n // Outputs: 1/3/2005 - %V,%G,%Y = 1,2005,2005echo 1/3/2005 - %V,%G,%Y = . strftime( %V,%G,%Y ,strtotime( 1/3/2005 )) . /n ? 

Example #3 Cross platform compatible example using the %e modifier

 ?php// Jan 1: results in: %e%1% (%%, e, %%, %e, %%)$format = %%e%%%e%% // Check for Windows to find and replace the %e // modifier correctlyif (strtoupper(substr(PHP_OS, 0, 3)) == WIN ) { $format = preg_replace( #(? !%)((?:%%)*)%e# , /1%#d , $format);echo strftime($format);? 

Example #4 Display all known and unknown formats.

 ?php// Describe the formats.$strftimeFormats = array( A = A full textual representation of the day , B = Full month name, based on the locale , C = Two digit representation of the century (year pided by 100, truncated to an integer) , D = Same as %m/%d/%y , E = , F = Same as %Y-%m-%d , G = The full four-digit version of %g , H = Two digit representation of the hour in 24-hour format , I = Two digit representation of the hour in 12-hour format , J = , K = , L = , M = Two digit representation of the minute , N = , O = , P = lower-case am or pm based on the given time , Q = , R = Same as %H:%M , S = Two digit representation of the second , T = Same as %H:%M:%S , U = Week number of the given year, starting with the first Sunday as the first week , V = ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week , W = A numeric representation of the week of the year, starting with the first Monday as the first week , X = Preferred time representation based on locale, without the date , Y = Four digit representation for the year , Z = The time zone offset/abbreviation option NOT given by %z (depends on operating system) , a = An abbreviated textual representation of the day , b = Abbreviated month name, based on the locale , c = Preferred date and time stamp based on local , d = Two-digit day of the month (with leading zeros) , e = Day of the month, with a space preceding single digits , f = , g = Two digit representation of the year going by ISO-8601:1988 standards (see %V) , h = Abbreviated month name, based on the locale (an alias of %b) , i = , j = Day of the year, 3 digits with leading zeros , k = Hour in 24-hour format, with a space preceding single digits , l = Hour in 12-hour format, with a space preceding single digits , m = Two digit representation of the month , n = A newline character ( /n ) , o = , p = UPPER-CASE AM or PM based on the given time , q = , r = Same as %I:%M:%S %p , s = Unix Epoch Time timestamp , t = A Tab character ( /t ) , u = ISO-8601 numeric representation of the day of the week , v = , w = Numeric representation of the day of the week , x = Preferred date representation based on locale, without the time , y = Two digit representation of the year , z = Either the time zone offset from UTC or the abbreviation (depends on operating system) , % = A literal percentage character ( % ) ,// Results.$strftimeValues = array();// Evaluate the formats whilst suppressing any errors.foreach($strftimeFormats as $format = $description){ if (False !== ($value = @strftime( %{$format} ))){ $strftimeValues[$format] = $value;// Find the longest value.$maxValueLength = 2 + max(array_map( strlen , $strftimeValues));// Report known formats.foreach($strftimeValues as $format = $value){ echo Known format : {$format} = , str_pad( {$value} , $maxValueLength), ( {$strftimeFormats[$format]} )/n // Report unknown formats.foreach(array_diff_key($strftimeFormats, $strftimeValues) as $format = $description){ echo Unknown format : {$format} , str_pad( , $maxValueLength), ($description ? ( {$description} ) : ), /n ? 

下面是其他网友的补充

php strftime()的使用

string strftime ( string format[,inttimestamp = time() ] )

返回用给定的格式字串对给出的 timestamp 进行格式输出后的字符串。如果没有给出时间戳则用当前的本地时间。

Example1:

 ?phpecho 本年中的第· . strftime( %W , strtotime( +2 week midnight -0 second )) . ·周 ? 

本年中的第·31·周

Example2:

 ?phpecho 現在時間是： . strftime( %d.%B %Y %H:%M:%S , time());? 

現在時間是：20.July 2015 17:01:26

Example3:

 ?phpecho 日期時間格式化為: . strftime( %d.%B %Y %H:%M:%S , strtotime( 2018-10-15 ? 

日期時間格式化為:15.October 2018 00:00:00

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