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Question:
What is the best way to calculate the difference in time, when time is greater than 24 hours.
<strong>Example</strong>
$time1 = '76:00:00';
$time2 = '30:00:00';
// result should be 46:00:00
echo date('H:i:s', strtotime($time1) - strtotime($time2));
But this could not be done with this because its greater then 24 hours.
Also in a database i've stored a time like this: 33:30:00 How in php could i format it to: 33:30
Answer1:Use \DateTime and \DateInterval to perform calculations:
$date1 = new \DateTime('now', new DateTimeZone('UTC'));
$date2 = new \DateTime('now', new DateTimeZone('UTC'));
$time1 = new \DateInterval('PT76H');
$time2 = new \DateInterval('PT30H');
$date1->add($time1);
$date2->add($time2);
$diff = $date1->diff($date2);
echo ($diff->days * 24 + $diff->h) . $diff->format(':%I:%S');
Explanation:
It's not possible to perform calculations directly on DateIntervals, so you have to create dates as a basis for calculations. Then add two different intervals to current dates, and calculate a difference between them. diff() returns \DateInterval that contains total number of days, that you have to multiply by 24 to get hours, and hours that don't make full days.
EDIT: The timezone should be specified as UTC to avoid daylight saving time issues.
