Difference in hours between dates

I have two different dates and different times, I would like to know how to do the calculation to get the difference in hours between these two dates example:

$Date1 = "2012-01-01";
$Date2 = "2012-01-02";

$hora1 = "20:00:00";
$hora2 = "21:00:00";

How to calculate the difference between days and hours?
eduardo12foxAsked:
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Ess KayConnect With a Mentor EntrapenuerCommented:
or use this
http://stackoverflow.com/questions/3371011/how-to-subtract-two-dates-and-times-to-get-difference


<?php
//$now = new DateTime(); // current date/time
$now = new DateTime("2010-07-28 01:11:50");
$ref = new DateTime("2010-07-30 05:56:40");
$diff = $now->diff($ref);
printf('%d days, %d hours, %d minutes', $diff->d, $diff->h, $diff->i);
prints 2 days, 4 hours, 44 minutes

see http://docs.php.net/datetime.diff

edit: But you could also shift the problem more to the database side, e.g. by storing the expiration date/time in the table and then do a query like
... WHERE key='7gedufgweufg' AND expires<Now()
Many rdbms have reasonable/good support for date/time arithmetic.
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Ess KayEntrapenuerCommented:
use date_add
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Ess KayEntrapenuerCommented:
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Ess KayEntrapenuerCommented:
date_sub — Subtracts an amount of days, months, years, hours, minutes and seconds from a DateTime object



http://php.net/manual/en/datetime.sub.php
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eduardo12foxAuthor Commented:
Very, very thank you!!
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