DateTime::diff

(PHP 5 >= 5.3.0)

DateTime::diff — Retourne la différence entre deux objets DateTime

Description

public DateInterval DateTime::diff ( DateTime $datetime [, bool $absolute ] )

Retourne la différence entre deux objets DateTime.

Liste de paramètres

datetime: La date de comparaison.
absolute: S'il faut retourner une différence absolue. Par défaut, FALSE.

Valeurs de retour

La différence entre les deux dates.

DateTime::format

DateTime::createFromFormat

Last updated: Fri, 14 Aug 2009

add a note User Contributed Notes
DateTime::diff

andarin2 at yahoo dot com
18-Nov-2009 10:32


The DateInterval format unfortunately leads to inconsitencies:



<?php

$start = new DateTime('2009-01-01 00:00:00'); // 31 days

$time_span = $start->diff(new DateTime('2009-02-01 00:00:00'));

var_dump($time_span); // returns '1 month'



$start = new DateTime('2009-02-01 00:00:00'); //28 days

$time_span = $start->diff(new DateTime('2009-03-01 00:00:01'));

var_dump($time_span); // returns '1 month'

?>



Of course it is possible to guess what does DateTime mean for a month, but in such case the invoking program should take care of month lengths and leap years (imagine counting days between dates years appart) - DateTime class is supposed to do that. In my opinion this function should return a value in seconds (or any other stable unit). Afterwards the program would have to convert the value as needed, but the value would be exact.

Anonymous
04-Aug-2009 12:17


You don't need to calculate the exact difference if you just want to know what date comes earlier:



<?php



date_default_timezone_set('Europe/Madrid');



$d1 = new DateTime('1492-01-01');

$d2 = new DateTime('1492-12-31');



var_dump($d1 < $d2);

var_dump($d1 > $d2);

var_dump($d1 == $d2);



?>



bool(true)

bool(false)

bool(false)

thinice at gmail dot com
17-Jul-2009 07:29


Some stuff to help you get started:





<?php


// See what's inside


$oDT = new DateTime();


var_dump($oDT);


?>





To do a date difference:





<?php


$oDT = new DateTime(); //Sets the object to now


$oDTDiff = $oDT->diff(new DateTime('2009-08-18 00:00:01'));


var_dump($oDTDiff);


echo "Days of difference: ". $oDTDiff->days;


?>

add a note

DateTime::format

DateTime::createFromFormat

Last updated: Fri, 14 Aug 2009