RE: subtracting time from date and time

["Richard Kurth" <richardkurth@xxxxxxxxxxxxxx>]

> -----Original Message-----
> From: Chris Boget [mailto:chris.boget@xxxxxxxx] 
> Sent: Monday, June 18, 2007 10:55 AM
> To: Brad Bonkoski; Richard Kurth
> Cc: php-general@xxxxxxxxxxxxx
> Subject: Re:  subtracting time from date and time
> 
> > Something like this will get it into a time stamp...and 
> then you can 
> > do your calculations with ease, and reformat...
> > <?php
> >        $str = "20070617T193500";
> >        list($date, $time) = explode("T",$str); ?>
> 
> Even easier:
> 
> $timestamp = strtotime( $str );
> http://us2.php.net/manual/en/function.strtotime.php
> 
> $oneMinute = 60; // seconds
> $oneHour    = $oneMinute * 60;
> $oneDay     = $oneHour * 24;
> 
> echo '5 minutes ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( 
> $oneMinute *
> 5 ));
> echo '5 hours ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( 
> $oneHour * 5 )); echo '5 days ago: ' . date( 'm/d/Y h:i:s', 
> $timestamp - ( $oneDay * 5 ));

This works great tell you get to 8 hours ago it shows the correct time but
it does not change the date to the day before. 8 hours ago should be 
06/16/2007 11:35:00 but what it shows is 06/17/2007 11:35:00

$str = "20070617T193500";
$timestamp = strtotime( $str );
$oneMinute = 60; // seconds
$oneHour    = $oneMinute * 60;
$oneDay     = $oneHour * 24;
echo 'time: ' . date( 'm/d/Y h:i:s', $timestamp );
echo"<br>";
echo '5 minutes ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneMinute *5
));
echo"<br>";
echo '15 minutes ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneMinute *15
));
echo"<br>";
echo '30 minutes ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneMinute *30
));
echo"<br>";
echo '1 hours ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneHour * 1 )); 
echo"<br>";
echo '2 hours ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneHour * 2 )); 
echo"<br>";
echo '5 hours ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneHour  * 5 ));
echo"<br>";
echo '7 hours ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneHour  * 7 ));
echo"<br>";
echo '8 hours ago: ' . date( 'm/d/Y h:i:s', $timestamp - ( $oneHour  * 8));

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