DateTime::modify

date_modify

(PHP 5 >= 5.2.0)

DateTime::modify -- date_modifyModifie le timestamp

Description

Style orienté objet

public DateTime DateTime::modify ( string $modify )

Style procédural

DateTime date_modify ( DateTime $object , string $modify )

Modifie le timestamp d'un objet DateTime en l'incrémentant ou le décrémentant dans un format acceptable par strtotime().

Liste de paramètres

object

Style procédural uniquement : Un objet DateTime retourné par la fonction date_create(). Cette fonction modifie cet objet.

modify

Une chaîne date/heure. Les formats valides sont expliqués dans la documentation sur les formats Date et Heure.

Valeurs de retour

Retourne l'objet DateTime pour chainer les méthodes ou FALSE si une erreur survient.

Historique

Version Description
5.3.6 Les requêtes date/heure absolues prennent maintenant effets. Auparavant, seules les parties relatives étaient utilisées.
5.3.0Changement de valeur de retour de NULL à DateTime en cas de succès.

Exemples

Exemple #1 Exemple avec DateTime::modify()

Style orienté objet

<?php
$date 
= new DateTime('2006-12-12');
$date->modify('+1 day');
echo 
$date->format('Y-m-d');
?>

Style procédural

<?php
$date 
date_create('2006-12-12');
date_modify($date'+1 day');
echo 
date_format($date'Y-m-d');
?>

Les exemples ci-dessus vont afficher :

2006-12-13

Exemple #2 Méfiez-vous lors de l'ajout ou la soustraction de mois

<?php
$date 
= new DateTime('2000-12-31');

$date->modify('+1 month');
echo 
$date->format('Y-m-d') . "\n";

$date->modify('+1 month');
echo 
$date->format('Y-m-d') . "\n";
?>

L'exemple ci-dessus va afficher :

2001-01-31
2001-03-03

Voir aussi

add a note add a note

User Contributed Notes 6 notes

up
13
jenspj at msn dot com
2 years ago
These functions makes sure that adding months or years always ends up in the month you would expect.  Works for positive and negative values

<?php
     
      
    $date
=new DateTime();
   
$date->setDate(2008,2,29);
   
    function
addMonths($date,$months){
        
       
$init=clone $date;
       
$modifier=$months.' months';
       
$back_modifier =-$months.' months';
       
       
$date->modify($modifier);
       
$back_to_init= clone $date;
       
$back_to_init->modify($back_modifier);
       
        while(
$init->format('m')!=$back_to_init->format('m')){
       
$date->modify('-1 day')    ;
       
$back_to_init= clone $date;
       
$back_to_init->modify($back_modifier);   
        }
       
       
/*
        if($months<0&&$date->format('m')>$init->format('m'))
        while($date->format('m')-12-$init->format('m')!=$months%12)
        $date->modify('-1 day');
        else
        if($months>0&&$date->format('m')<$init->format('m'))
        while($date->format('m')+12-$init->format('m')!=$months%12)
        $date->modify('-1 day');
        else
        while($date->format('m')-$init->format('m')!=$months%12)
        $date->modify('-1 day');
        */
       
   
}
    
    function
addYears($date,$years){
       
       
$init=clone $date;
       
$modifier=$years.' years';
       
$date->modify($modifier);
       
        while(
$date->format('m')!=$init->format('m'))
       
$date->modify('-1 day');
       
       
    }
   
   
   
   
addMonths($date,-1);
    
addYears($date,3);
   
   
    echo
$date->format('F j,Y');
    

?>
up
5
jay dot removethis at grooveshark dot com
1 year ago
Due to DST and the way DateTime internally handles dates, it's possible to get stuck in a time loop.

For example:

<?php
$dt
= new DateTime('2012-03-11 3:00AM');
echo
$dt->format('YmdH') . "\n";
$dt->modify("-1 hour");
echo
$dt->format('YmdH') . "\n";
$dt->modify("-1 hour");
echo
$dt->format('YmdH') . "\n";
?>

prints out:

2012031103
2012031103
2012031103

if your timezone is set to America/New_York.
up
2
php at lanar dot com dot au
1 year ago
modify() ignores any timezone information in the data while the DateTime constructor does not.

$dt = new DateTime( '2013-10-26T11:00:00+11:00' )
will create a +11 timezone while
$dt->modify( '2013-10-26T11:00:00+02:00' )
does not change the timezone or the time.

<?php
$dt
= new DateTime( '2013-10-26T15:00:00Australia/Melbourne' ) ;
echo
"\n", $dt->format( "c" ) ;
echo
"\nTimezone '", $dt->getTimezone()->getName() . "'." ;
// modify $dt to 1 am new york which is 3 pm melbourne
$dt->modify( '2013-10-26T01:00:00America/New_York' ) ;
// result is 1 am melbourne time, not 3 pm
echo "\n", $dt->format( "c" ) ;
echo
"\nTimezone '", $dt->getTimezone()->getName() . "'." ;
?>
Output
2013-10-26T15:00:00+11:00
Timezone 'Australia/Melbourne'.
2013-10-26T01:00:00+11:00
Timezone 'Australia/Melbourne'.
up
2
66Ton99
6 months ago
Extension for DateTime class which solves problem of adding or subtracting months

https://gist.github.com/66Ton99/60571ee49bf1906aaa1c
up
1
Jenny jsimonds@atomic jet packs dot com
2 years ago
Note: This method modifies the object in-place. So if you want to calculate a new date but assign the new value to a different object, this will NOT work:

<?php
$numMinutes
= 25;
$oDateA = new DateTime('2012-01-01 12:00:00');

print
"
Original:<br>
oDateA = 
{$oDateA->format('Y-m-d H-i-s')}<br>
"
;

$oDateB = $oDateA->modify ("+{$numMinutes} minutes");

print
"
plus
{$numMinutes} minutes:<br>
oDateA = 
{$oDateA->format('Y-m-d H-i-s')}<br>
oDateB = 
{$oDateB->format('Y-m-d H-i-s')}<br>
"
;
?>
...produces this:
oDateA = 2012-01-01 12-00-00
plus 25 minutes:
oDateA = 2012-01-01 12-25-00
oDateB = 2012-01-01 12-25-00

Use something like this instead:
<?php
$numMinutes
= 25;
$oDateA = new DateTime('2012-01-01 12:00:00');

print
"
<p>
Original:<br>
oDateA = 
{$oDateA->format('Y-m-d H-i-s')}<br>
"
;

$oDateB = clone $oDateA;
$oDateB->modify ("+{$numMinutes} minutes");

print
"
plus
{$numMinutes} minutes:<br>
oDateA = 
{$oDateA->format('Y-m-d H-i-s')}<br>
oDateB = 
{$oDateB->format('Y-m-d H-i-s')}<br>
"
;
?>

... produces this:
oDateA = 2012-01-01 12-00-00
plus 25 minutes:
oDateA = 2012-01-01 12-00-00
oDateB = 2012-01-01 12-25-00
up
1
admin at wmfoi dot com dot br
7 months ago
The changelog says: "5.3.0 - Changed the return value on success from NULL to DateTime".

That means that you can't do a Fluid Interface design with it in PHP 5.2.

In other words, this will not work in 5.2:

<?php
$DateTime
=new DateTime();
echo
$DateTime->modify('+1 day')->format('d');
?>
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