DateTime::add adds hours even when interval should only be seconds

Question

This comes from my previous question on getting the average time interval over a specified data set, [located here][1]. I\'ll post the entire function again:

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Answer 1

As I wrote in the answer to your other question, this is a DST (Daylight Savings Time) problem. In the U.S., DST has already begun; in Europe not.

Try this code:

timecheck("Europe/Amsterdam");
timecheck("America/Los_Angeles");

function timecheck($timezone) {
date_default_timezone_set($timezone);

$totalATB=new DateTime("@0");
$t1 = "2014-01-01 17:30:00";
$t2 = "2014-01-01 17:35:00";

$dt1 = new DateTime($t1);
$dt2 = new DateTime($t2);

$timeDiff = date_diff($dt1, $dt2, true);

printf("[%s] Starting with with: %s\n", $timezone, $totalATB->format("H:i:s"));
$totalATB->add($timeDiff);
printf("[%s] added %s, total is now: %s\n", $timezone, $timeDiff->format("%H:%I:%S"), $totalATB->format("H:i:s"));
}

The output:

[Europe/Amsterdam] Starting with with: 00:00:00
[Europe/Amsterdam] added 00:05:00, total is now: 00:05:00
[America/Los_Angeles] Starting with with: 00:00:00
[America/Los_Angeles] added 00:05:00, total is now: 01:05:00