Re: subtracting time from date and time

Richard Kurth wrote:

-----Original Message----- From: Chris Boget [mailto:chris.boget@wild.net] Sent: Monday, June 18, 2007 10:55 AM To: Brad Bonkoski; Richard Kurth Cc: php-general@lists.php.net Subject: Re: [PHP] 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";

Notice that this time stamp is formatted in 24/hr days. so year 2007 month 6 day 17 hour 19 = 7pm (not 7am) minute 15 second 00

$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));

-- Jim Lucas "Some men are born to greatness, some achieve greatness, and some have greatness thrust upon them." Twelfth Night, Act II, Scene V by William Shakespeare