I need help with date calculations!!

[reya276]

I'm trying to calculate an some dates times prices. I'm actually trying to built a reservations systems for a villa (not a hotel) and the thing is that I can't use the MYSQL date features because I have to insert the dates my self, to understand it better you can go here: http://www.ohproductions.com/villa/checkin.php(go through the date selection proccess and confirm the dates next you will see were the function comes into play). Any ways this is the actual calculation code that I have so far, but the results are all wrong please HELP!!!!!

<?php
$days = $HTTP_POST_VARS['varday'] - $HTTP_POST_VARS['outday'];
//here all I need is to know how many days the customer will stay at the villa.

$price = $HTTP_POST_VARS['varprice'] + $HTTP_POST_VARS['outprice'];
//here I'm adding the actual total price for the arrival date and the checkout date.

$total = $days * $price;
//here I'm multiplying the results of the dates x the actual total price.

?>

I tried to use the "mktime" command but it's too complicated for me I'm not an expert on PHP yet.

[OhLordy]

I always find it easiest to use the UNIX Timestamp (the nummber of seconds elapsed since the 1st January 1970);

If you get your two dates in three variables, $day, $month, $year you can use the mktime function to make a timestamp

<?
$timestamp=mktime(0,0,0,$mont,$day,$year,0);
?>

You can then subtract the later timestamp from the erlier one and then find out how many days that is by

<?
$days=($time_stamp1-$timestamp2)/(60*60*24);
?>

HTH
Rob