Adjusting time zone in PHP with DateTime / DateTimeZone - php

Question

There's a lot of info on doing time zone adjustments in PHP, but I haven't found an answer for specifically what I want to do due to all the noise.
Given a time in one timezone, I want to convert it to the time in another timezone.
This is essentially what I want to do, but I need to be able to do it using only the built-in PHP libs, not PEAR Date.
This is what I've been doing, but it seems to always give me the offset relative to GMT:
$los_angeles_time_zone = new DateTimeZone('America/Los_Angeles');
$hawaii_time_zone = new DateTimeZone('Pacific/Honolulu');
$date_time_los_angeles = new DateTime('2009-09-18 05:00:00', $los_angeles_time_zone);
printf("LA Time: %s<br/>", $date_time_los_angeles->format(DATE_ATOM));
$time_offset = $hawaii_time_zone->getOffset($date_time_los_angeles);
printf("Offset: %s<br/>", $time_offset);
This is the output:
LA Time: 2009-09-18T05:00:00-07:00
Offset: -36000
I was expecting 3 hours (10800 seconds). but the '-7:00' thing tells me it's keeping everything relative to GMT, which maybe explains why it's giving me the "absolute" offset.
How do I just get the offset between the two timezones without all of this GMT hoohah?
Thanks.
UPDATE:
I occured to me that I could do this and get what I want:
$date_time_los_angeles = new DateTime('2009-09-18 05:00:00', $los_angeles_time_zone);
printf("LA Time: %s<br/>", $date_time_los_angeles->format(DATE_ATOM));
$date_time_hawaii = new DateTime('2009-09-18 05:00:00', $hawaii_time_zone);
printf("Hawaii Time: %s<br/>", $date_time_hawaii->format(DATE_ATOM));
$time_offset = $los_angeles_time_zone->getOffset($date_time_los_angeles) - $hawaii_time_zone->getOffset($date_time_los_angeles);
printf("Offset: %s<br/>", $time_offset);
But it feels awkward to me. Anyone know a cleaner way to do it?

Answer 1

Here are a couple of functions using the DateTime classes. The first one will return the difference in seconds between two timezones. The second returns a "translation" of the time from one timezone to another.
function timezone_diff($tz_from, $tz_to, $time_str = 'now')
{
$dt = new DateTime($time_str, new DateTimeZone($tz_from));
$offset_from = $dt->getOffset();
$timestamp = $dt->getTimestamp();
$offset_to = $dt->setTimezone(new DateTimezone($tz_to))->setTimestamp($timestamp)->getOffset();
return $offset_to - $offset_from;
}
function time_translate($tz_from, $tz_to, $time_str = 'now', $format = 'Y-m-d H:i:s')
{
$dt = new DateTime($time_str, new DateTimezone($tz_from));
$timestamp = $dt->getTimestamp();
return $dt->setTimezone(new DateTimezone($tz_to))->setTimestamp($timestamp)->format($format);
}
Demo:
$los_angeles_time = '2009-09-18 05:00:00';
$los_angeles_tz = 'America/Los_Angeles';
$hawaii_tz = 'Pacific/Honolulu';
$los_angeles_hawaii_diff = timezone_diff($los_angeles_tz, $hawaii_tz, $los_angeles_time);
echo $los_angeles_hawaii_diff . '<br />';
$hawaii_time = time_translate($los_angeles_tz, $hawaii_tz, $los_angeles_time);
echo $hawaii_time . '<br />';

Answer 2

As GZipp commented, his code is really only for PHP >= 5.3.0. That is fine, but - here's a version that will work in PHP >= 5.2.0. (Incidentally, it also works in 5.3+, and with 2 less function calls)
<?php
function time_translate($tz_from, $tz_to, $time_str = 'now', $format = 'Y-m-d H:i:s')
{
$dt = new DateTime($time_str, new DateTimezone($tz_from));
$dt->setTimezone(new DateTimezone($tz_to));
return $dt->format($format);
}
$time_diffs = array('now', '-1 hour', '-1 day', '-1 week', '-1 month', '+1 hour', '+1 week', '+1 month');
foreach ($time_diffs as $diff)
{
echo "{$diff}:"
. "\n\t"
. "Current: " . date("Y-m-d H:i:s", strtotime($diff))
. "\n\t"
. "UTC: " . time_translate("US/Eastern", "UTC", $diff)
. "\n\n";
}

Answer 3

Simply minus the first time from the second.
That you'll be able to get the time difference in terms of seconds.