Hello, Perhaps this has something to do with the daylight savings time calculations being handled by the underlying system, since the difference is 1 hour; 60*60 = 3600. This could be checked to make sure that the total time difference from one year remains the same, or that the first 6 months has 1 hour less and the second 6 months have one hour more. see http://en.wikipedia.org/wiki/Daylight_saving_time_around_the_world for details. Apparently 29.10 is a common daylight savings date, here in the states the actual date can change. -Michael On 8/16/07, Peter Wechtersbach <peterw@xxxxxxxx> wrote: > > Hello, im found some strange behaviour. Someone knows whats is going on or > it is a bug?: > > lets do like this: > > three dates in timestamp: > 27.10.2007: 1193436000 > 28.10.2007: 1193522400 > 29.10.2007: 1193612400 > > convert back: > 1193436000: 27.10.2007 00:00:00 > 1193522400: 28.10.2007 00:00:00 > 1193612400: 29.10.2007 00:00:00 > > And one day is always 24 hours * 60 minutes * 60 secondes = 86400. So the > difference between these three dates in timestamp should also be the > same.But: > day2-day1 = 86400 > day3-day2 = 90000 > > Here is my code, im using PHP Version 5.1.6: > > echo ' three dates in timestamp: <br>'; > $day1 = mktime(0, 0, 0, 10, 27, 2007); > $day2 = mktime(0, 0, 0, 10, 28, 2007); > $day3 = mktime(0, 0, 0, 10, 29, 2007); > > echo '27.10.2007: '.$day1.'<br>'; > echo '28.10.2007: '.$day2.'<br>'; > echo '29.10.2007: '.$day3.'<br><br>'; > > echo 'convert back: <br>'; > echo $day1.': '.date('d.m.Y H:i:s',$day1).'<br>'; > echo $day2.': '.date('d.m.Y H:i:s',$day2).'<br>'; > echo $day3.': '.date('d.m.Y H:i:s',$day3).'<br><br><br>'; > > echo 'And one day is always 24 hours * 60 minutes * 60 secondes = > 86400. So the difference between these three dates in timestamp should > also > be the same.But: <br>'; > > echo 'day2-day1 = '.($day2-$day1).'<br>'; > echo 'day3-day2 = '.($day3-$day2).'<br>'; > > -- > PHP Windows Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >
