Timezone Conversion in PHP

Timezone conversion in php

You can use the datetime object or their function aliases for this:

Example (abridged from PHP Manual)

date_default_timezone_set('Europe/London');

$datetime = new DateTime('2008-08-03 12:35:23');
echo $datetime->format('Y-m-d H:i:s') . "\n";
$la_time = new DateTimeZone('America/Los_Angeles');
$datetime->setTimezone($la_time);
echo $datetime->format('Y-m-d H:i:s');

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Edit regarding comments

but i cannt use this method because i need to show date in different time zones as the user login from different locations

That's not a problem. When a user logs in, you determine his timezone and set it to your DateTime object just like shown. I'm using a similar approach in one of my projects and it works like a charm.

in the database i need to get the dates in any single timezone, then only it can be processed properly

You store the time either as a timestamp or a datetime in one timezone. When you query a DateTime field, you either convert the time in a DateTime object to this timezone or - if your db supports it - query with the selected timezone.

converting a time to a different timezone with php

Use the date_default_timezone_set() function of PHP.

If you want to change it to France you would use the

date_default_timezone_set('Europe/Paris');

a list of Supported Timezones can be found here:
http://www.php.net/manual/en/timezones.php

The functionality of date_default_timezone_set() can be found here:
http://php.net/manual/en/function.date-default-timezone-set.php

How to convert between time zones in PHP using the DateTime class?

What you're looking for is this:

$triggerOn = '04/01/2013 03:08 PM';
$user_tz = 'America/Los_Angeles';

echo $triggerOn; // echoes 04/01/2013 03:08 PM

$schedule_date = new DateTime($triggerOn, new DateTimeZone($user_tz) );
$schedule_date->setTimeZone(new DateTimeZone('UTC'));
$triggerOn =  $schedule_date->format('Y-m-d H:i:s');

echo $triggerOn; // echoes 2013-04-01 22:08:00

PHP: Convert Timezone Name

These are IDs of Microsoft Windows time zones. PHP uses IANA/Olson time zones. See the timezone tag wiki for details.

You'll find a mapping of these zones here, as part of the Unicode CLDR.

I have written conversion functions for .NET, which you can find here. You can probably use the original sources to write similar functions in PHP or whatever language you choose.

How to convert time from one timezone to another in PHP

date_default_timezone_set('Europe/London');

$datetime = new DateTime('2008-08-03 12:35:23');
echo $datetime->format('Y-m-d H:i:s') . "\n";
$la_time = new DateTimeZone('America/Los_Angeles');
$datetime->setTimezone($la_time);
echo $datetime->format('Y-m-d H:i:s');

Convert UTC dates to local time in PHP

date() and localtime() both use the local timezone for the server unless overridden; you can override the timezone used with date_default_timezone_set().

http://www.php.net/manual/en/function.date-default-timezone-set.php

http://us3.php.net/manual/en/function.date.php

http://php.net/manual/en/function.localtime.php

Converting between timezones in PHP

I would not use date_default_timezone_set for general TZ conversions. (To clarify... if this is for display purposes, script wide, then using the default timezone is a reasonable thing to do.)

Instead, I would use something like:

$tz = new DateTimeZone('America/Los_Angeles');

$date = new DateTime('Thu, 31 Mar 2011 02:05:59 GMT');
$date->setTimezone($tz);
echo $date->format('l F j Y g:i:s A I')."\n";

Using PHP DateTime to parse and convert timezone PST to PDT (GMT -8 to GMT -7)

Not the greatest but it's the only way I can think of to do this

$tz = new DateTimeZone('America/Los_Angeles');  
$saleEndDate = new DateTime("2016-11-07T17:30:00-08:00");
$saleEndDate->setTimezone($tz);
$stamp = $saleEndDate->format('U');
$zone = $tz->getTransitions($stamp, $stamp);
if(!$zone[0]['isdst']) $saleEndDate->modify('+1 hour');
echo $saleEndDate->format('Y-m-d H:i:s');

What I'm doing here is using the DateTimeZone::getTransitions function to determine if the date you provided is DST or not. If it isn't, we add one hour. Note that this does not change the time zone, it just corrects for the DST shift

You can see it in action here

Convert time and date from one time zone to another in PHP

<?php
$date = new DateTime('2000-01-01', new DateTimeZone('Pacific/Nauru'));
echo $date->format('Y-m-d H:i:sP') . "\n";

$date->setTimezone(new DateTimeZone('Pacific/Chatham'));
echo $date->format('Y-m-d H:i:sP') . "\n";
?>

The above examples will output:

2000-01-01 00:00:00+12:00
2000-01-01 01:45:00+13:45

found on DateTime Manual on php.net

EDIT:
Like Pekka said: The DateTime class exists from 5.2 on and there you first have to find out which of the methods are realy implemented and which one only exist from 5.3 on.

PHP date() with timezone?

For such task, you should really be using PHP's DateTime class. Please ignore all of the answers advising you to use date() or date_set_time_zone, it's simply bad and outdated.

I'll use pseudocode to demonstrate, so try to adjust the code to suit your needs.

Assuming that variable $tz contains string name of a valid time zone and variable $timestamp contains the timestamp you wish to format according to time zone, the code would look like this:

$tz = 'Europe/London';
$timestamp = time();
$dt = new DateTime("now", new DateTimeZone($tz)); //first argument "must" be a string
$dt->setTimestamp($timestamp); //adjust the object to correct timestamp
echo $dt->format('d.m.Y, H:i:s');

DateTime class is powerful, and to grasp all of its capabilities - you should devote some of your time reading about it at php.net. To answer your question fully - yes, you can adjust the time zone parameter dynamically (on each iteration while reading from db, you can create a new DateTimeZone() object).

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