Re: Strange Result of Datetime::diff

03.04.2017 18:44, Christoph M. Becker пишет:

On 03.04.2017 at 15:28, Aziz Saleh wrote:

On Mon, Apr 3, 2017 at 8:39 AM, <naitsirch@e.mail.de> wrote:

I'd expect the following script: <?php $date1 = new DateTime('2017-03-01'); $date2 = new DateTime('2017-04-02'); $diff = $date1->diff($date2); echo "{$diff->m} months and {$diff->d} days."; ?> would print "1 months and 0 days.". But instead it prints "1 months and 3 days." (see https://3v4l.org/RMuUZ). What is the reason for this behaviour?

You sure about that, the above should yield 1 months and 1 days since you have an extra day there: http://sandbox.onlinephpfunctions.com/code/fe7c7d989101ab5e1dd1530d457bfcc7a1cfa8fa

But see <https://3v4l.org/N5fg7>! Please, read this: <https://bugs.php.net/bug.php?id=52480>.

DateTime::diff works with UTC timezone. So, it converts current DateTime object to UTC timezone. If you want to understand how it calculated, do $date1->setTimeZone(new DateTimeZone('UTC')); $date2->setTimeZone(new DateTimeZone('UTC')); and watch what actual values are used in diff. One of the ways to calculate difference is to use timezone UTC for DateTime object $date1 = new DateTime('2017-03-01', new DateTimeZone('UTC')); It calculates difference without time shifts and DTS rules.