idate
The functions shown below may help implement a timezones library.
<?php
/**
* This function returns the server timezone offset in seconds
* e.g. Sydney in DST returns +1100 / 100 * 60 * 60 = 39600
*/
function getServerTimeZoneOffset()
{
return date("O") / 100 * 60 * 60; // Seconds from GMT
}
/**
* This function returns the local timezone offset in seconds
* where getTimeZone($userid) returns a timezone see below.
*/
function getLocalTimeZoneOffset($userid)
{
return getTimeZone($userid) / 100 * 60 * 60; // Seconds from user GMT
}
// Now converting a server timestamp to a local timestamp is very simple.
/**
* Will take a timestamp and minus off Server GMT and add on user GMT seconds
* thereby making a local timestamp from a server timestamp.
*/
function getLocalTimestampFromServerTimestamp($userid, $timestamp)
{
return $timestamp - getServerTimeZoneOffset() + getLocalTimeZoneOffset( $userid );
}
//And getting the local time from a user entered date is a useful function.
//Combine the next two functions to achieve just that.
function getLocalTimestampFromDateTime($userid, $datetime)
{
$timestamp = strtotime($datetime);
return getLocalTimestampFromServerTimestamp($userid, $timestamp);
}
/**
* If you have a localized timestamp and just want to get the date format use this.
*/
function getFormattedDate($userid, $timestamp)
{
return date("Y-m-d H:i:s " . getTimeZone($userid), $timestamp);
}
/**
* Returns a timezone in the format +0000
* e.g. Perth in DST returns +0900
*/
function getTimeZone($userid)
{
return "+0900"; // Perth in DST
}
?>
localtime
(PHP 4, PHP 5)
localtime — Récupère l'heure locale
Description
array localtime
([ int $timestamp
[, bool $is_associative
]] )
localtime() retourne un tableau identique à la structure retournée par la fonction C localtime.
Liste de paramètres
- timestamp
-
Le paramètre optionnel timestamp est un timestamp Unix de type entier qui vaut par défaut l'heure courante locale si le paramètre timestamp n'est pas fourni. En d'autres termes, il faut par défaut la valeur de la fonction time().
- is_associative
-
si défini à FALSE ou ignoré, force localtime() à retourner un tableau à index numérique. S'il est mis à TRUE, localtime() retourne un tableau associatif, avec tous les éléments de la structure C, accessible avec les clés. Les noms des différentes clés du tableau associatif sont les suivants :
- "tm_sec" - secondes
- "tm_min" - minutes
- "tm_hour" - heure
- "tm_mday" - jour du mois Les mois commencent à 0 (Jan) à 11 (Dec) et les jours de la semaine commencent à 0 (Dimanche) à 6 (Samedi).
- "tm_mon" - mois de l'année, commence par 0 pour Janvier
- "tm_year" - Année depuis 1900
- "tm_wday" - Jour de la semaine
- "tm_yday" - Jour de l'année
- "tm_isdst" - Est-ce que l'heure d'hiver a pris effet ?
Erreurs / Exceptions
Chaque appel à une fonction date/heure générera un message de type E_NOTICE si le fuseau horaire n'est pas valide., et/ou un message de type E_STRICT si vous utilisez la configuration du système ou la variable d'environnement TZ. Voir aussi date_default_timezone_set()
Historique
| Version | Description |
|---|---|
| 5.1.0 | Émet un message de type E_STRICT et E_NOTICE lors d'erreurs de fuseaux horaires. |
Exemples
Exemple #1 Exemple avec localtime()
<?php
$localtime = localtime();
$localtime_assoc = localtime(time(), true);
print_r($localtime);
print_r($localtime_assoc);
?>
L'exemple ci-dessus va afficher quelque chose de similaire à :
Array ( [0] => 24 [1] => 3 [2] => 19 [3] => 3 [4] => 3 [5] => 105 [6] => 0 [7] => 92 [8] => 1 ) Array ( [tm_sec] => 24 [tm_min] => 3 [tm_hour] => 19 [tm_mday] => 3 [tm_mon] => 3 [tm_year] => 105 [tm_wday] => 0 [tm_yday] => 92 [tm_isdst] => 1 )
add a note
User Contributed Noteslocaltime
hutch120 at gmail dot com
08-Nov-2007 02:23
08-Nov-2007 02:23
anomie at users dot sourceforge dot net
08-Dec-2006 09:22
08-Dec-2006 09:22
Here is another version of gmtime(). This one doesn't involve messing around with timezones at all. Note that PHP4 users should check out the array_combine page for replacements for that function.
<?php
function gmtime($ts=null, $is_associative=false){
if(is_null($ts)) $ts=time();
$t=array_map('intval',explode(',',gmdate('s,i,H,d,m,Y,w,z,I',$ts)));
$t[4]--;
$t[5]-=1900;
if(!$is_associative) return $t;
return array_combine(array('tm_sec','tm_min','tm_hour','tm_mday','tm_mon',
'tm_year','tm_wday','tm_yday','tm_isdst'),
$t);
}
?>
matt (at) roughest [d0t] net
27-Oct-2004 07:49
27-Oct-2004 07:49
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
24-Feb-2004 07:35
24-Feb-2004 07:35
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:
<?php
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;
}
?>
!!emiliop!! AT nospam dot dorial dot com
20-Feb-2003 09:12
20-Feb-2003 09:12
To calculate the delta between the local time and UTC:
<?php
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
09-Dec-2002 10:25
09-Dec-2002 10:25
You can implement gmtime quote simply.
<?php
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 04:57
03-Jun-2002 04:57
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 09:42
26-Apr-2002 09:42
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.
-----------------------------------------------
<?php
//
// File: gmttime.php
//
// 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 04:29
31-Mar-2002 04:29
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 07:05
22-Aug-2001 07:05
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 02:23
22-Jul-2001 02:23
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 !