localtime

说明

array localtime ( [int timestamp [, bool is_associative]] )

localtime() 函数返回一个数组，其结构和 C 函数调用返回的完全一样。localtime() 的第一个参数是时间戳，如果没有给出则使用从 time() 返回的当前时间。第二个参数是 is_associative，如果设为 FALSE 或未提供则返回的是普通的数字索引数组。如果该参数设为 TRUE 则 localtime() 函数返回包含有所有从 C 的 localtime 函数调用所返回的不同单元的关联数组。关联数组中不同的键名为：

"tm_sec" - 秒数
"tm_min" - 分钟数
"tm_hour" - 小时
"tm_mday" - 月份中的第几日
"tm_mon" - 年份中的第几个月，从 0 开始表示一月
"tm_year" - 年份，从 1900 开始
"tm_wday" - 星期中的第几天
"tm_yday" - 一年中的第几天
"tm_isdst" - 夏令时当前是否生效

注: 月份从 0（一月）到 11（十二月），星期数从 0（星期天）到 6（星期六）。

例子 1. time() 例子
<?php $localtime = localtime(); $localtime_assoc = localtime(time(), true); print_r($localtime); print_r($localtime_assoc); ?>
上例的输出类似于：
Array ( [0] => 24 [1] => 3 [2] => 19 [3] => 3 [4] => 3 [5] => 105 [6] => 0 [7] => 92 [9] => 1 ) Array ( [tm_sec] => 24 [tm_min] => 3 [tm_hour] => 19 [tm_mday] => 3 [tm_mon] => 3 [tm_year] => 105 [tm_wday] => 0 [tm_yday] => 92 [tm_isdst] => 1 )

add a note User Contributed Notes

matt (at) roughest [d0t] net
27-Oct-2004 01:49


Be careful with the "tm_isdst" element. It may be incorrect for certain localities where daylight savings time is not observed (for example most of Saskatchewan in Canada).

tony at speedscript dot com
25-Feb-2004 02:35


Date select box for the current week, or whatever week you give for an offset (in seconds), returns the string you can echo with the select box named $name:



function week_date_selectbox( $time_offset, $name )

    {

    if( isset( $time_offset ) )

        $t = time() + $time_offset;

    else

        $t = time();



    $wday = array("Sun ","Mon ","Tue ","Wed ","Thu ","Fri ","Sat ");

    $mon = array("Jan ","Feb ","Mar ","Apr ","May ","Jun ","Jul ","Aug ","Sep ","Oct ","Nov ","Dec ");

    $mybox = "<select name=\"$name\">\n";

    for($ii = 0; $ii > -6; $ii--)

        {

        $tarr = localtime( $t + $ii * 86400, 1 );

        if( $tarr["tm_wday"] == 0 )

            {

            // found Sunday, now make the week's strings

            for($jj = 0; $jj < 7; $jj++)

                {

                $tarr = localtime( $t + ($jj + $ii) * 86400, 1 );

                $mybox .= sprintf( " <option value=\"%04d-%02d-%02d\">%s%s%d %d</option>\n",

                        ((int)$tarr["tm_year"] + 1900),

                        $tarr["tm_mon"],

                        ((int)$tarr["tm_mday"] + 1),

                        $wday[$tarr["tm_wday"]],

                        $mon[$tarr["tm_mon"]],

                        (int)$tarr["tm_mday"],

                        ((int)$tarr["tm_year"] + 1900) );

                }

            break;

            }

        }

    $mybox .= "</select>\n";



    return $mybox;

    }

tomm174RemoveThis at hotmail dot com
01-May-2003 02:55


For useful notes on converting between local time *at the browser* see

http://martin.f2o.org/php/localtime

!!emiliop!! AT nospam dot dorial dot com
20-Feb-2003 04:12


To calculate the delta between the local time and UTC:



function tzdelta ( $iTime = 0 )

{

    if ( 0 == $iTime ) { $iTime = time(); }

    $ar = localtime ( $iTime );

    $ar[5] += 1900; $ar[4]++;

    $iTztime = gmmktime ( $ar[2], $ar[1], $ar[0],

        $ar[4], $ar[3], $ar[5], $ar[8] );

    return ( $iTztime - $iTime );

}



So if your system is in DST, tzdelta should return -18000 (five hours less).

arch at archtech dot yi dot org
10-Dec-2002 05:25


You can implement gmtime quote simply.



function GetTZOffset() { 

  $Offset = date("O", 0);

   

  $Parity = $Offset < 0 ? -1 : 1;

  $Offset = $Parity * $Offset;

  $Offset = ($Offset - ($Offset % 100))/100*60 + $Offset % 100;



  return $Parity * $Offset;

}



$TZOffset = GetTZOffset();



$t_time = time()-$TZOffset*60; #Counter adjust for localtime()

$t_arr = localtime($t_time);

static
03-Jun-2002 10:57


Be VERY CAREFUL with the return of this function if you intend to feed it straight back into mktime(). localtime() returns months as 0 to 11, but mktime uses months as 1 to 12. The resulting off-by-one errors can be ... unpleasant.



You Have Been Warned.



Wade.

jausions-N at SPAM-hotmail dot com
26-Apr-2002 03:42


I strongly suggest to do all of your developments using GMT/UTC dates & times.



I provide here a version of a 'gmttime' function. Save it in a separate file and include it when needed.



Please post a correction here if you find it not working for your timezone (with or without daylight saving time.). 



Thanks & Enjoy.

-----------------------------------------------



//

// File: gmttime.in-p

//

// Description:

//    Implements the gmttime function if missing from the PHP distribution

//



// Verifies that the function isn't already implemented

if (function_exists(gmttime))

    return;



//

// Function: gmttime

//

// Description:

//   Returns an array indexed as by the localtime() function:

//   - 0 or tm_sec: Seconds

//   - 1 or tm_min: Minutes

//   - 2 or tm_hour: Hour

//   - 3 or tm_mday: Day of the month

//   - 4 or tm_mon: Month of the year

//   - 5 or tm_year: Years since 1900

//   - 6 or tm_wday: Day of the week

//   - 7 or tm_yday: Day of the year

//   - 8 or tm_isdst: Is daylight saving time in effect

//   - tm_fyear: Full year (only available with associative array)

//

// Arguments:

//   - Timestamp

//   - Boolean (for associative indexing: 0 = off, 1 = on)

//

// Returns:

//   An array on success,

//   false on failure.

//

function gmttime($dTimestamp = '', $bAssoc = 0) {

    // Evaluate how much difference there is between local and GTM/UTC

    // Don't forget to correct for daylight saving time...

    $aNow = localtime();

    $iDelta = gmmktime(1, 1, 1, 1, 1, 1970, $aNow[8]) - mktime(1, 1, 1, 1, 1, 1970, $aNow[8]);



    if (!$bAssoc) {

        if ($dTimestamp == '') {

            return localtime(time() - $iDelta, 0);

        } else {

            return localtime($dTimestamp - $iDelta, 0);

        }

    } else {

        // For associative array, add full year index

        if ($dTimestamp == '') {

            $aGMTTime = localtime(time() - $iDelta, 1);

        } else {

            $aGMTTime = localtime($dTimestamp - $iDelta, 1);

        }

        $aGMTTime['tm_fyear'] = $aGMTTime['tm_year'] + 1900;

        return $aGMTTime;

    } // End [IF] return associative array?

} // End [FUNCTION] gmttime

bens_nospam at benjamindsmith dot com
31-Mar-2002 10:29


You must keep in mind the difference between your server's time and your client's time! 



I ran into this one when I wrote a calendar-based reminder system with SMS messaging - guys back east were always getting their messages late. (!?!) 



I wrote two functions as wrappers for date handling, ServerTime() and ClientTime() that take client time (integer timestamp) and translate to server time and vice-versa based on config file settings. 



Needless to say, you CANNOT FORGET THIS.

test at test dot de
22-Aug-2001 01:05


to set up berlin time it could look like this:





<?php


    print "<HTML><body><pre>";


    


    setlocale( "LC_ALL", "de_DE" );


    


    putenv( "PHP_TZ=Europe/Berlin" );


    


    $now = time();


    


    print_r( localtime(time(),true) );


    print_r( getdate() );


    


    print date("H:i:s");


    print date("T");


    


?>

verdy_p at wanadoo dot fr
22-Jul-2001 08:23


The corresponding function call to get the GMT time is not specified here. Only local time is reported, according to the current TZ environment setting.


One could try to use putenv() to set another timezone temporarily, however when running PHP in safe mode, putenv() is disabled and cannot be used in scripts.


However it's possible to simulate gmttime() by using localtime() and by transforming the results in the returned array.


The biggest problem with this function is that it is using an OS-dependent and localtime() function which is also depending on the standard C library implementation (some of them, do not support accurate locales). The second problem is that localtime() does not return an index specifying the local timezone offset, so transforming this date to UTC will become very ugly. Some systems support the gmtime() C function call, some don't. To get the timezone, some C libraries provide a global _timezone variable, some provide it as a macro that use a function call, some do not provide any variable, and one must deduce it by interpreting the TZ environment. This is too much ugly for PHP.





PHP should be extended by adding support to gmttime() with the same parameters, but the returned array should include additional indices to store the timezone offsets in seconds and names for both standard time and DST, for example:


 [tz_offset_std] = 3600,


 [tz_offset_dst]= 7200,


 [tz_name_std] = 'CET', (GMT+01:00)


 [tz_name_dst] = 'CEDT'. (GMT+02:00)


Or for the international, locale-independant, Zulu time (also known as UCT or simply UT), returned by gmtime():


 [tz_offset] = 0,


 [tz_offset_dst]= 0,


 [tz_name] = 'Z',


 [tz_name_dst] = 'Z'.





But it's much easier to use PHP's date() and gmdate() to make such transformations.





Beware of DST rules! In the southern hemisphere, standard time still occurs during winter, but the southern Winter is in June, not in December ! Use the tm_isdst indicator to know which timezone to display or interpret !

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