Unexpected results when subtracting two time values [closed]

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This is really strange. I have two time values.

First time:

$t1 = 1311165885;

Second time (which is bigger than the first time):

$t2 = 1312049530;

I am going to subtract the times like this:

$diff = $t2-$t1;

When I do an echo $diff this is coming out:

echo 'Time_diff: ' . $diff; 
Time_diff: -1311163874

The actual result should be 883645. What is wrong?

Thanks in advance!

Craphunter

Then here is my code:

<?php 
$current_time = DataConverter::makeDatetime();

foreach ($order as $list) {
    echo '-----------'.'</br>';
    $create_unix_time = DataConverter::makeTimestamp($list->getCreate());
    $diff = $current_time-$create_unix_time;

    if ($diff >= 864000) {
        echo开发者_开发问答 'aus db: ' .  $list->getErstellt() . '</br>';
        echo $list->getId() . '</br>';
        echo 'old';
    }
    else {
    }
}

?>

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<?php

$t1 = 1311165885;
$t2 = 1312049530;
$diff = $t2-$t1;

echo 'Time 1: ' . date('Y-m-d H:i:s', $t1) . PHP_EOL;
echo 'Tim2 2: ' . date('Y-m-d H:i:s', $t2) . PHP_EOL;
echo 'Time diff: ' . $diff . PHP_EOL;

... prints this:

Time 1: 2011-07-20 14:44:45
Tim2 2: 2011-07-30 20:12:10
Time diff: 883645

What you say you are getting does look like a regular timestamp rather than a diff:

echo date('Y-m-d H:i:s', 1311163874) . PHP_EOL;

... prints:

2011-07-20 14:11:14

There's probably a mistyped variable name somewhere in your code.

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I ignore the data type result of method DataConverter::makeTimestamp. Maybe that is a wrong assumption suppose the result is integer. Maybe. But, you can force the data type to integer and test if that is the problem.

$current_time = intVal( DataConverter::makeDatetime() );

and

$create_unix_time = intVal( DataConverter::makeTimestamp( $list->getCreate() ) );