DateTime loses an hour

[hidden_premise]

Hi all,

I have a loop that is modifying a DateTime object. It goes through X number of times and adds 1 day to the date time object and stores the modified object in an array. I use ->add(new DateInterval('P1D')); For some reason it is losing an hour each time that I add a day. I start out at 19:00 and each iteration through the loop adds a day, but loses an hour.

2010-09-19 19:00:00

2010-09-20 18:00:00

2010-09-21 17:00:00

 

I can correct for this by doing ->add(new DateInterval('P1DT1H'));, but adding 25 hours instead of 24 hours doesn't make any sense to me. I am using PHP Version 5.3.1.

 

Any ideas?

 

Thanks,

W

[jcbones]

My test server is PHP 5.3.0

 

<?php
$time = new DateTime();

for($i = 0; $i < 10; $i++) {
echo $time->format('m-d-Y H:i:s') . '<br />';
$time->add(new DateInterval('P1D'));
}

?>

 

Outputs:

09-18-2010 22:11:44

09-19-2010 22:11:44

09-20-2010 22:11:44

09-21-2010 22:11:44

09-22-2010 22:11:44

09-23-2010 22:11:44

09-24-2010 22:11:44

09-25-2010 22:11:44

09-26-2010 22:11:44

09-27-2010 22:11:44

 

[hidden_premise]

Here is what I'm seeing

echo "<BR/><BR/>LOOPING - BEFORE begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);
            $date_begin->add(new DateInterval('P1D'));
            $date_end->add(new DateInterval('P1D'));
            echo "<BR/>LOOPING - AFTER begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);

 

output

LOOPING - BEFORE begin: 09/16/10 07:00 PM end: 09/16/10 11:50 PM

LOOPING - AFTER begin: 09/17/10 06:00 PM end: 09/17/10 10:50 PM

 

 

Could this be some bizarre timezone issue?

[btherl]

What happens if you use 24 hours instead of 1 day?

[hidden_premise]

echo "<BR/><BR/>LOOPING - BEFORE begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);
            $date_begin->add(new DateInterval('PT24H'));
            $date_end->add(new DateInterval('PT24H'));
            echo "<BR/>LOOPING - AFTER begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);

LOOPING - BEFORE begin: 09/16/10 07:00 PM end: 09/16/10 11:50 PM

LOOPING - AFTER begin: 09/17/10 06:00 PM end: 09/17/10 10:50 PM

 

if I make it 25 hours though or 1 day 1 hour

            echo "<BR/><BR/>LOOPING - BEFORE begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);
            $date_begin->add(new DateInterval('PT25H'));
            $date_end->add(new DateInterval('PT25H'));
            echo "<BR/>LOOPING - AFTER begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);

LOOPING - BEFORE begin: 09/16/10 07:00 PM end: 09/16/10 11:50 PM

LOOPING - AFTER begin: 09/17/10 07:00 PM end: 09/17/10 11:50 PM

 

 

 

[jcbones]

Here is my test, again PHP 5.3.0

 

PS. This would help if you would post ALL relevant code.

 

 

<?php$date_begin = new DateTime('2010-10-12 14:00:23');$date_end = new DateTime('2010-10-13 18:00:23');define('DATE_FORMAT', 'm/d/Y h:i:s A');echo "<BR/><BR/>LOOPING - BEFORE begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);            $date_begin->add(new DateInterval('P1D'));            $date_end->add(new DateInterval('P1D'));            echo "<BR/>LOOPING - AFTER begin: " . $date_begin->format(DATE_FORMAT) . " end: " . $date_end->format(DATE_FORMAT);?>

 

 

Output.

 

LOOPING - BEFORE begin: 10/12/2010 02:00:23 PM end: 10/13/2010 06:00:23 PM

LOOPING - AFTER begin: 10/13/2010 02:00:23 PM end: 10/14/2010 06:00:23 PM