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5.0

How to return the correct user time if the server is somewhere else...

Asked by pr0fess0r in PHP and Databases

Tags: epoch_seconds, gettimezoneoffset, offset

Hi Guys - I'm gonna post this in the Javascript forum too... here goes.
I have a MySQL/PHP database being stored on a US PHP server but I am in New Zealand.
When a user logs in, I want to store the difference between their time and server time in minutes in a PHP session variable. To work around the potential Daylight Savings issues, and incorrect Time Zone settings, I assume the user's PC is set to their correct time.
I assumed that the Date() function in javascript returned the date/time on the user's machine (Javascript is clientside, right?)
So on the login form I have:
...
<input type=hidden name=clienttime>
...
<SCRIPT LANGUAGE="JavaScript"><!--
var now = new Date();
var epoch_seconds=Math.round(now.getTime()/1000);
document.form.clienttime.value=epoch_seconds;
//--></SCRIPT>

and in my php I set a session variable to the difference between time() - the server time in seconds since epoch - and my clienttime value.
...
$_SESSION["SESSION_TIMEOFFSET"] = $clienttime-time();
...
I expected this to work out to xxxx seconds. So, any time the user added something to the the database, it would go in as the server time, but any time the user views anything from the database, the time offset is applied so they see the data in their time.
But, my code doesnt work! Date() seems to be returning the server time!
Can anyone suggest a solution? I'd prefer not to use javascript's getTimeZoneOffset if i dont have to, because this can be inaccurate.
Is my thinking flawed?
NB Please dont refer me to this article - http://www.i-source101.com/read.php?articleid=5 I have seen copies of it everywhere and it's just confusing :)

many thanks in advance
[+][-]05/20/03 02:32 PM, ID: 8553787Accepted Solution

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About this solution

Zone: PHP and Databases
Tags: epoch_seconds, gettimezoneoffset, offset
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Solution Provided By: Big_Red_Dog
Participating Experts: 2
Solution Grade: C
 
[+][-]05/19/03 05:11 PM, ID: 8547668Expert Comment

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