php date format

I have recently updated by database date formats from xx/xx/xxxx to strtotime values (Thanks Ray P) but I still have an application which is working on the old format:

I have a text box on a php page which is sent to another page using GET
The original value in the text box is : 25/09/2012

The url sent is as follows:
?dte1=25%2F09%2F2012

I need to ba able to use a strtotime function  on this on the second page to convert to a time string:
ie
$newvariable = strtotime($_GET[dte1]);

The problem is that the resulting strtotime value is not correct. I can only assume that this is because of the way the string is encoded in the url string initially
Is hrere a way round this ?
doctorbillAsked:
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Barry62Connect With a Mentor Commented:
$newvariable = strtotime(str_replace("%2","/",$_GET[dte1]));
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doctorbillAuthor Commented:
Same problem:

If I use 11/10/2012 as an initial date:

With your suggestion I get 1352505600
The actual figure should be 1349910000

ps I know it should be 1349910000 because that is what has been created in my database when the 11/10/2012 was inserted using the strtotime function a while back
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Barry62Commented:
I think you must have transposed some numbers.  The difference between the number you got with my suggestion and what you say the actual number should be is 2595600.  That translates out to 1 month.
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Lukasz ChmielewskiCommented:
Isn't that about
http://php.net/manual/en/function.strtotime.php#106105
... difference with American and European time format ?
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Mark GilbertConnect With a Mentor Senior Performance EngineerCommented:
Might I suggest you read the following article I wrote about date formatting, especially when using a database. There are very simple sql statements you can use which will do all the formatting you need without the construction of lines of php code which will add to the execution time of your app:

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_3935-Working-with-Dates-and-Time-using-PHP-and-MySQL.html
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Ray PaseurConnect With a Mentor Commented:
Please see http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_201-Handling-date-and-time-in-PHP-and-MySQL.html

Please see http://www.laprbass.com/RAY_temp_doctorbill.php

<?php // RAY_temp_doctorbill.php
error_reporting(E_ALL);

$wrong = '25/09/2012';
$array = array_reverse(explode('/', $wrong));
$right = implode('-', $array);
var_dump($wrong);
var_dump($right);

$rdate = @date('r', @strtotime($right));
var_dump($rdate);

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doctorbillAuthor Commented:
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Mark GilbertConnect With a Mentor Senior Performance EngineerCommented:
Because strtotime translates to Unix Timestamp...the Unix Epoch time that started in 1970. When you feed just a date it will translate to the date and use a time of 0000 hours. It's not a great time format to use...did you choose this for field size? For 4 bytes you could use an actual mysql timestamp. Your mysql database has all the tools and features available for you to process your date stuff quickly and efficiently without bloating your application with many lines of extra code.

At the moment your database supports one type of format, however what happens if you need to take up hosting somewhere else in the world where your timezone will change, as will perhaps the date format. By using integers instead of timestamps, lines of code to hack a date into and out of mysql changing order of ddmmyyyy to yymmdd is setting yourself up for tons of work in the future. When you do move, by keeping timestamp formats your database will adjust itself accordingly...however with ints and translations you're going to have to reprocess that data, reformat it and put it back into the db.
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doctorbillAuthor Commented:
I managed to get this to work:
$dt1 = strtotime(str_replace("/","-",$_GET[dte1]));

Thanks VERY much for all the wealth of information re. dates - I fully appreciate I need to read up on the subject for the future. I did not know that dates could demand so much attention
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doctorbillAuthor Commented:
Solved
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