Local time instead of GMT

I’ve tried to use post.post_date and customfield containing the date value in a mail template and I realized that they are always displayed in GMT. Because the local time value is more useful in emails, I’ve added the ‘useLocalTime’ modifier and handling code in src\Types\Parameters\BaseParameter.php:

    public function formatDate($value, $modifiers)
    {
        $waOptions = get_option('wunderauto-general');

        $format = null;
        if (isset($modifiers->format)) {
            $format = $modifiers->format;
        }
        if (empty($format) && isset($waOptions['datetimeformat']) && strlen($waOptions['datetimeformat']) > 0) {
            $format = $waOptions['datetimeformat'];
        }
        if (empty($format)) {
            $format = get_option('date_format');
        }

        /* MF+ handle useLocalTime modifier */
        $timestamp = $this->toEpoch($value);
        if (isset($modifiers->useLocalTime)) {
       		$timestamp = $timestamp + floatval( get_option( 'gmt_offset', 0 ) ) * HOUR_IN_SECONDS;
        }

        return date($format, $timestamp);
        /* +MF */
    }

Take a look on it, if you find it useful, feel free to include it in future releases.