Description:
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datetime diff return wrong result in date (2018-3-22 - 2018-3-23). it return 23 hours.
in my test this problem is in Asia/Tehran Timezone.
i test several years and all years in this date has same problem except (2000).
also i test in php versions 5.6 and 7.1

Test script:
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$dateStart  = new DateTime('2018-3-22');
$dateEnd    = new DateTime('2018-3-23');

$diff  = $dateStart->diff($dateEnd);
echo $diff->format("%a Day and %h hours %i minutes %s seconds");


Expected result:
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1 Day and 0 hours 0 minutes 0 seconds

Actual result:
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0 Day and 23 hours 0 minutes 0 seconds