How many seconds in a week?!?!

[mapleleaf]

<?php
function get_weekly($start, $end)
    {
        $dates = array();
        
        while($start < $end) {
            array_push($dates,date("D m y",$start));
            $start = $start + (86400 * 7); // perhaps erroneous concept of the number of seconds in a week
        }
        return $dates;
    }
    $start = strtotime("Tue 10th Jul 2012");
    $end = strtotime("Tue 10th Jul 2013");
    echo "<pre>";
    print_r(get_weekly($start, $end));
    echo "</pre";
    
    ?>

 

And the results which I think amount to a bug in PHP:

Array
(
    [0] => Tue 07 12
    [1] => Tue 07 12
    [2] => Tue 07 12
    [3] => Tue 07 12
    [4] => Tue 08 12
    [5] => Tue 08 12
    [6] => Tue 08 12
    [7] => Tue 08 12
    [8] => Tue 09 12
    [9] => Tue 09 12
    [10] => Tue 09 12
    [11] => Tue 09 12
    [12] => Tue 10 12
    [13] => Tue 10 12
    [14] => Tue 10 12
    [15] => Tue 10 12
    [16] => Tue 10 12
    [17] => Mon 11 12
    [18] => Mon 11 12
    [19] => Mon 11 12
    [20] => Mon 11 12
    [21] => Mon 12 12
    [22] => Mon 12 12
    [23] => Mon 12 12
    [24] => Mon 12 12
    [25] => Mon 12 12
    [26] => Mon 01 13
    [27] => Mon 01 13
    [28] => Mon 01 13
    [29] => Mon 01 13
    [30] => Mon 02 13
    [31] => Mon 02 13
    [32] => Mon 02 13
    [33] => Mon 02 13
    [34] => Mon 03 13
    [35] => Tue 03 13
    [36] => Tue 03 13
    [37] => Tue 03 13
    [38] => Tue 04 13
    [39] => Tue 04 13
    [40] => Tue 04 13
    [41] => Tue 04 13
    [42] => Tue 04 13
    [43] => Tue 05 13
    [44] => Tue 05 13
    [45] => Tue 05 13
    [46] => Tue 05 13
    [47] => Tue 06 13
    [48] => Tue 06 13
    [49] => Tue 06 13
    [50] => Tue 06 13
    [51] => Tue 07 13
    [52] => Tue 07 13
)

 

How did Monday get in there??

[DavidAM]

How many seconds in a week depends entirely on what week you are talking about. There are two weeks in each year that will have 1 hour more or less than the usual -- the weeks when Daylight Saving Time changes.

 

The best approach for your situation is to use strtotime :

 

 $start = strtotime("+1 week", $start);

 

instead of adding some number of seconds.

 

 

[Psycho]

The best approach for your situation is to use strtotime :

 

 $start = strtotime("+1 week", $start);

 

instead of adding some number of seconds.

 

^^ - I'd agree with that. But, I've seen some quirky things with strtotime() when adding/subtracting as well. When trying to move forward/back a day at a time it is always best, IMO, to always normalize the time to be noon. That way the results will not be affected by Daylight Savings time.

[mapleleaf]

Thanks both.

I have also seen some strange things with strtotime but it is still the best option here I suppose.