Time subtraction

[jpratt]

I have two timestamps comming in from a mysql database. For my testing Im using the following stamps:

 

2007-12-17 15:30:00

2007-12-17 17:00:00

 

My page needs to display a select box with the values between the stamps every half an hour. so in this instance it should loop and display the following values in the box:

 

3:30 pm

4:00 pm

4:30 pm

 

I have played with the following without luck:

 

while ($stime != $etime) {
echo "<option value='" . $stime . "'>" . date("g:i a", strtotime($stime)) . "</option>";
$stime = date("i", strtotime($stime)) + 30;
}

 

The ideo is to loop through until the start and end stamps match. Any idea on how to do this?

[Barand]

try

<?php
$d1 = '2007-12-17 15:30:00';
$d2 = '2007-12-17 17:00:00';

$t1 = strtotime($d1);
$t2 = strtotime($d2);

while ($t1 < $t2)
{
echo date ('g:i a', $t1), '<br/>';
$t1 = strtotime('+30 minutes', $t1);
}
?>