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    The DateInterval class

    (PHP 5 >= 5.3.0, PHP 7)

    소개

    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.

    클래스 개요

    DateInterval {
    /* 프로퍼티 */
    public integer $y ;
    public integer $m ;
    public integer $d ;
    public integer $h ;
    public integer $i ;
    public integer $s ;
    public integer $invert ;
    public mixed $days ;
    /* 메소드 */
    public __construct ( string $interval_spec )
    public static DateInterval createFromDateString ( string $time )
    public string format ( string $format )
    }

    프로퍼티

    y

    Number of years.

    m

    Number of months.

    d

    Number of days.

    h

    Number of hours.

    i

    Number of minutes.

    s

    Number of seconds.

    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.

    Table of Contents

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    User Contributed Notes 3 notes

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    31
    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
    up
    1
    julio dot necronomicon at gmail dot com
    10 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");
    ?>
    up
    -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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