这篇文章主要介绍了php strftime函数的详细用法，strftime() 函数根据区域设置格式化本地时间／日期，一般情况下可以用来时间格式化,需要的朋友可以参考下
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：
//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,...)
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
Example #2 ISO 8601:1988 week number example
// Outputs: 12/28/2002 - %V,%G,%Y = 52,2002,2002
echo "12/28/2002 - %V,%Y = " . strftime("%V,%Y",strtotime("12/28/2002")) . "\n";
// Outputs: 12/30/2002 - %V,%Y = 1,2003,2002
echo "12/30/2002 - %V,strtotime("12/30/2002")) . "\n";
// Outputs: 1/3/2003 - %V,2003
echo "1/3/2003 - %V,strtotime("1/3/2003")) . "\n";
// Outputs: 1/10/2003 - %V,%Y = 2,2003
echo "1/10/2003 - %V,strtotime("1/10/2003")) . "\n";
/* December 2004 / January 2005
ISOWk M Tu W Thu F Sa Su
51 13 14 15 16 17 18 19
52 20 21 22 23 24 25 26
53 27 28 29 30 31 1 2
1 3 4 5 6 7 8 9
2 10 11 12 13 14 15 16 */
// Outputs: 12/23/2004 - %V,2004,2004
echo "12/23/2004 - %V,strtotime("12/23/2004")) . "\n";
// Outputs: 12/31/2004 - %V,%Y = 53,2004
echo "12/31/2004 - %V,strtotime("12/31/2004")) . "\n";
// Outputs: 1/2/2005 - %V,2005
echo "1/2/2005 - %V,strtotime("1/2/2005")) . "\n";
// Outputs: 1/3/2005 - %V,2005,2005
echo "1/3/2005 - %V,strtotime("1/3/2005")) . "\n";
?>
Example #3 Cross platform compatible example using the %e modifier
// Jan 1: results in: '%e%1%' (%%,e,%%,%e,%%)
$format = '%%e%%%e%%';
// Check for Windows to find and replace the %e
// modifier correctly
if (strtoupper(substr(PHP_OS,3)) == 'WIN') {
$format = preg_replace('#(?<!%)((?:%%)*)%e#','\1%#d',$format);
}
echo strftime($format);
?>
Example #4 Display all known and unknown formats.
'A full textual representation of the day','B' => 'Full month name,based on the locale','C' => 'Two digit representation of the century (year divided 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,'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,'l' => 'Hour in 12-hour format,'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(' ',($description ? " ( {$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:
本年中的第·31·周
Example2:
現在時間是：20.July 2015 17:01:26
Example3:
日期時間格式化為:15.October 2018 00:00:00
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