Server time and setlocale()

[woolyg]

Hi all,

At the start of my file, I'm setting a variable so that I can timestamp (in DATETIME) the current moment:

<?php
$SG_now = date("Y-m-d H:i:s");
?>

 

I'm using the above variable to save the timestamps of the server time (UTC/GMT -7 hours) - the server is in the US. All timestamps going into the DB will be in server time.

 

My users will be dotted around the planet, so I'm using setlocale for their area & time, after the above code:

 

<?php
// For example, London
setlocale(LC_ALL, 'en-UK');
?>

 

So that would make:

<?php
$LOCAL_now = date("Y-m-d H:i:s");
?>

 

My question is - how would I find the difference, in hours, between $SG_now and $LOCAL_now ?

 

All input appreciated!

Wool