DateTimeZone::getTransitions

timezone_transitions_get

(PHP 5 >= 5.2.0)

DateTimeZone::getTransitions -- timezone_transitions_getDevuelve todas las transiciones para una zona horaria

Descripción

Estilo orientado a objetos

public array DateTimeZone::getTransitions ([ int $timestamp_begin [, int $timestamp_end ]] )

Estilo por procedimientos

array timezone_transitions_get ( DateTimeZone $object [, int $timestamp_begin [, int $timestamp_end ]] )

Parámetros

object

Estilo por procesos solamente: Un objeto DateTimeZone es devuelto por timezone_open()

timestamp_begin

Marca de tiempo de inicio.

timestamp_end

Marca de tiempo final.

Valores devueltos

Deveulve una matriz numérica que contiene una matriz asociativa con todas las transiciones si se tuvo éxito o FALSE en caso de error.

Historial de cambios

Versión Descripción
5.3.0 Se añadieron los parámetros opcionales timestamp_begin y timestamp_end.

Ejemplos

Ejemplo #1 Un ejemplo de timezone_transitions_get()

<?php
$zona_horaria 
= new DateTimeZone("Europe/London");
$transiciones $zona_horaria->getTransitions();
print_r(array_slice($transiciones03));
?>

El resultado del ejemplo sería algo similar a:

Array
(
    [0] => Array
        (
            [ts] => -2147483648
            [time] => 1901-12-13T20:45:52+0000
            [offset] => 3600
            [isdst] => 1
            [abbr] => BST
        )

    [1] => Array
        (
            [ts] => -1691964000
            [time] => 1916-05-21T02:00:00+0000
            [offset] => 3600
            [isdst] => 1
            [abbr] => BST
        )

    [2] => Array
        (
            [ts] => -1680472800
            [time] => 1916-10-01T02:00:00+0000
            [offset] => 0
            [isdst] => 
            [abbr] => GMT
        )

)

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User Contributed Notes 4 notes

up
3
scotts
4 years ago
Getting a timezone's offset and other data at a specified point in time (now, for example) using the new PHP5.3 parameters:

<?php
$theTime
= time(); # specific date/time we're checking, in epoch seconds.

$tz = new DateTimeZone('America/Los_Angeles');
$transition = $tz->getTransitions($theTime,$theTime);

# only one array should be returned into $transition. Now get the data:
$offset = $transition[0]['offset'];
$abbr = $transition[0]['abbr'];
?>

Before PHP5.3, you'd have to loop through all of the Transitions up until the current point in time, which would be a very inefficient process.
up
2
rubo77
11 months ago
This will work  in PHP_VERSION < 5.3:

<?php
/** returns an array with two elements for spring and fall DST in a given year
*  works in PHP_VERSION < 5.3
*
* @param integer $year
* @param string $tz timezone
* @return array
**/
function getTransitionsForYear($year=null, $tz = null){
    if(!
$year) $year=date("Y");

    if (!
$tz) $tz = date_default_timezone_get();
   
$timeZone = new DateTimeZone($tz);

    if (
version_compare(PHP_VERSION, '5.3.0') >= 0) {
       
$transitions = $timeZone->getTransitions(mktime(0, 0, 0, 2, 1, $year),mktime(0, 0, 0, 11, 31, $year));
       
$index=1;
    } else {
       
// since 1980 it is regular, the 29th element is 1980-04-06
            // change this in your timezone
           
$first_regular_index=29;
           
$first_regular_year=1980;
       
$transitions = $timeZone->getTransitions();
       
$index=($year-$first_regular_year)*2+$first_regular_index;
    }
    return
array_slice($transitions, $index, 2);
}
up
0
tanguy dot pruvot at gmail dot com
1 year ago
Beware if you use getTransitions() without a minimum date, it can be slow...
up
-1
rubo77
11 months ago
This function will work in PHP < 5.3 :

/** returns an array with two elements for spring and fall DST in a given year
*
* @param integer $year
* @param string $tz timezone
* @return array
**/
function getTransitionsForYear($year=null, $tz = null){
    if(!$year) $year=date("Y");
   
    if (!$tz) $tz = date_default_timezone_get();
    $timeZone = new DateTimeZone($tz);
   
    $transitions = $timeZone->getTransitions(mktime(0, 0, 0, 1, 1, $year));
    return array_slice($transitions, 1, 2);
}
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