Piwik\Plugins\SitesManager\API::getTimezonesListUTCOffsets PHP Method

    private function getTimezonesListUTCOffsets()
    {
        // manually add the UTC offsets
        $GmtOffsets = array(-12, -11.5, -11, -10.5, -10, -9.5, -9, -8.5, -8, -7.5, -7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 6, 6.5, 7, 7.5, 8, 8.5, 8.75, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 13.75, 14);
        $return = array();
        foreach ($GmtOffsets as $offset) {
            $offset = Common::forceDotAsSeparatorForDecimalPoint($offset);
            if ($offset > 0) {
                $offset = '+' . $offset;
            } elseif ($offset == 0) {
                $offset = '';
            }
            $offset = 'UTC' . $offset;
            $offsetName = str_replace(array('.25', '.5', '.75'), array(':15', ':30', ':45'), $offset);
            $return[$offset] = $offsetName;
        }
        return $return;
    }