CODEWITHSUNDEEP
phptimezoneoffset
fbiville
fbiville

Reputation: 8950

PHP - weird timezone offset

I'm encountering a stupid problem which I just cannot understand. How come that following piece of code:

public function getFormattedOffsetFrom($refTimezoneId = 'Europe/Paris', $format = 'G\hi') {
    $timestamp = time();
    $reference = new DateTime('@'.$timestamp);
    $referenceTimeZone = new DateTimeZone($refTimezoneId);
    $reference->setTimezone($referenceTimeZone);
    $datetime = new DateTime('@'.$timestamp);
    $datetime->setTimezone($this->timezone);
    $offset = $this->timezone->getOffset($datetime) - $referenceTimeZone->getOffset($reference);
    $prefix = '+';
    if($offset < 0) {
        $prefix = '-';
        $offset = abs($offset);
    }
    return $prefix.date($format, $offset);
}

where $this->timezone is an instance of DateTimeZone positioned in Europe/Madrid, produces +1h00 when no args are specified ????

Paris and Madrid have no time offset. I just don't understand.

Thanks a lot for your help !!!! Florent

Upvotes: 1

Views: 500

Answers (2)

dev-null-dweller
dev-null-dweller

Reputation: 29462

Why should be 0 ? Both Spain and France are using GMT+1 as time zone.

http://en.wikipedia.org/wiki/File:Time_zones_of_Europe.svg

The problem is that you are trying to format $offset that holds time difference in seconds, with function date(), which expects timestamp as second parameter. If the $offset == 0 date function recognizes it as 1970-01-01 00:00:00 GMT, so in your timezone it will be 1970-01-01 01:00:00 GMT+1, and you are using format to return hours and minutes so that is why you have +1 as output.

You have to manually format this time difference like this:

$offsetH = floor( $offset / 3600 ); //full hours
$offsetM = floor(($offset - $offsetH) / 60 ); //full minutes

return sprintf("%s%sh%02s",$prefix,$offsetH,$offsetM) ;

Upvotes: 2

rik
rik

Reputation: 8612

The problem can be reduced to date('G', 0) giving "1". Solution is to use gmdate().

Upvotes: 1

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