RETURNS the difference between two DateTime objects.
<?php
/* - - - - - - - - - - - - - - - - - - -
Object oriented style I
- - - - - - - - - - - - - - - - - - - */
DateInterval public DateTime::diff ( DateTimeInterface $targetObject ,
bool $absolute = false )
where,
$targetObject = The date to compare to
$absolute = To control the interval
?>
<?php
/* - - - - - - - - - - - - - - - - - - -
Object oriented style II
- - - - - - - - - - - - - - - - - - - */
DateInterval DateTimeImmutable::diff ( DateTimeInterface $targetObject ,
bool $absolute = false )
where,
$targetObject = The date to compare to
$absolute = To control the interval
?>
<?php
/* - - - - - - - - - - - - - - - - - - - - -
Object oriented style III
- - - - - - - - - - - - - - - - - - - - - */
DateInterval public DateTimeInterface::diff ( DateTimeInterface $targetObject ,
bool $absolute = false )
where,
$targetObject = The date to compare to
$absolute = To control the interval
?>
<?php
/* - - - - - - - - - - - - - - - - -
Procedural style
- - - - - - - - - - - - - - - - - */
DateInterval date_diff ( DateTimeInterface $baseObject ,
DateTimeInterface $targetObject ,
bool $absolute = false )
where,
$baseObject = The date to compare to targetObject
$targetObject = The date to compare to $baseObject
$absolute = To control the interval
?>
EXERCISE
<?php
if(class_exists("DateTime") &&
class_exists("DateTimeZone") &&
class_exists("DateInterval"))
{
$dtm_01 = new DateTime("UTC");
$dtm_02 = new DateTime("UTC");
echo '<br>public DateTime add<br><br>';
$dtib = new DateInterval('P2Y0M0D');
$dtm_01_add = $dtm_01->add($dtib);
echo 'From this moment the date will have the following value:<br>';
foreach((array)$dtm_01->add($dtib) as $dtm01a => $dt01a)
{
echo $dtm01a . ' = ' . $dt01a . '<br>';
}
echo '<br><br>public DateTime sub:<br><br>';
$nw_dti = new Dateinterval('P3Y2M10D');
$dtm_01_sub = $dtm_01->sub($nw_dti);
echo 'From this moment the date will have the following value:<br>';
foreach((array)$dtm_01->sub($nw_dti) as $dtm01b => $dt01b)
{
echo $dtm01b . ' = ' . $dt01b . '<br>';
}
echo '<br><br>public DateInterval diff:<br>';
$dtm_01_diff = $dtm_01->diff($dtm_02, false);
$dtm_02_diff = $dtm_01->diff($dtm_02, true);
foreach((array)$dtm_02_diff as $dtm01c => $dt01c)
{
echo $dtm01c . ' = ' . $dt01c . '<br>';
}
}
else
{
echo "The required classes are not available in this system";
}
?>
EXERCISE
<?php
// full notation
$i = new DateInterval( 'P0006-01-17T06:12:30' );
// abbreviated notation
$i = new DateInterval( 'P3DT6H' );
// from a difference
$d1 = new DateTime();
$d2 = new DateTime( "2019-09-09 09:09 Asia/Tokyo" );
$i = $d1->diff( $d2 );
// displaying the difference
echo $i->format( '%a days, %h hours, %i minutes' ), "<br>";
?>
EXERCISE
<?php
$dt03a = new DateTime('now');
$dt03b = new DateTime('2000-03-09');
$int03a = date_diff($dt03a, $dt03b, TRUE);
echo $int03a->format('%R%Y years or %a days');
?>
EXERCISE
<?php
$start = new DateTime('1945-03-08 08:33:33');
$end = new DateTime('now');
$int = (array)$start->diff($end);
foreach($int as $k => $v)
echo $k . ' = ' . $v . '<br>';
?>