The DateInterval class

(PHP 5 >= 5.3.0, PHP 7)

Introducere

Represents a date interval.

A date interval stores either a fixed amount of time (in years, months, days, hours etc) or a relative time string in the format that DateTime's constructor supports.

More specifically, the information in an object of the DateInterval class is an instruction to get from one date/time to another date/time. This process is not always reversible.

A common way to create a DateInterval object is by calculating the difference between two date/time objects through DateTimeInterface::diff().

Sinopsisul clasei

DateInterval {

/* Proprietăți */

public int $y ;

public int $m ;

public int $d ;

public int $h ;

public int $i ;

public int $s ;

public float $f ;

public int $invert ;

public mixed $days ;

/* Metode */

public __construct ( string $duration )

public static createFromDateString ( string $datetime ) : DateInterval|false

public format ( string $format ) : string

}

Proprietăți

y

Number of years.

m

Number of months.

d

Number of days.

h

Number of hours.

i

Number of minutes.

s

Number of seconds.

f

Number of microseconds, as a fraction of a second.

invert

Is 1 if the interval represents a negative time period and 0 otherwise. See DateInterval::format().

days

If the DateInterval object was created by DateTime::diff(), then this is the total number of days between the start and end dates. Otherwise, days will be false.

Before PHP 5.4.20/5.5.4 instead of false you will receive -99999 upon accessing the property.

Istoricul schimbărilor

Versiune	Descriere
7.1.0	The `f` property was added.

Cuprins

DateInterval::__construct — Creates a new DateInterval object
DateInterval::createFromDateString — Sets up a DateInterval from the relative parts of the string
DateInterval::format — Formats the interval

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User Contributed Notes 3 notes

down

cb ¶

1 year ago


If you want to reverse a date interval use array_reverse and iterator_to_array. I've found using invert to be unreliable.

<?php
$start_date = date_create("2021-01-01");
$end_date   = date_create("2021-01-05"); // If you want to include this date, add 1 day

$interval = DateInterval::createFromDateString('1 day');
$daterange = new DatePeriod($start_date, $interval ,$end_date);

function show_dates ($dr) {
    foreach($dr as $date1){
        echo $date1->format('Y-m-d').'<br>';
    }
}
 
show_dates ($daterange);
   
echo '<br>';

// reverse the array

$daterange = array_reverse(iterator_to_array($daterange));

show_dates ($daterange);
           
?>

Gives 
 2021-01-01
 2021-01-02
 2021-01-03
 2021-01-04

 2021-01-04
 2021-01-03
 2021-01-02
 2021-01-01

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julio dot necronomicon at gmail dot com ¶

3 months ago


More simple example i use to add or subtract.

<?php
$Datetime = new Datetime('NOW', new DateTimeZone('America/Bahia'));
$Datetime->add(DateInterval::createFromDateString('2 day'));

echo $Datetime->format("Y-m-d H:i:s");
?>

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-2

nateb at gurutechnologies dot net ¶

4 years ago


Many people have commented on doing a reverse interval on a date time.  I personally find a backwards year to be a little strange to think about and instead opt to work with just intervals.  This is the easiest I have found.

<?php
$one_year = new DateInterval('P1Y');
$one_year_ago = new DateTime();
$one_year_ago->sub($one_year);
?>

Instead of:

<?php
$one_year_ago = new DateInterval( "P1Y" );
$one_year_ago->invert = 1;
$one_year_ago = new DateTime();
$one_year_ago->add($one_year);
?>

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