Srain

date +"%Y-%m-%dT%H:%M:%S%:z"

$time = time();
$time_str = date('c', $time);

$time = strtotime($time_str);

/**
 * Transform Date to ISO 8601 string.
 */
public static String fromDate(final Date date) {
    String formatted = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").format(date);
    return formatted.substring(0, 22) + ":" + formatted.substring(22);
}

/**
 * Transform ISO 8601 string to Date.
 */
public static Date toDate(final String iso8601string) throws ParseException {
    String s = iso8601string.replace("Z", "+00:00");
    try {
        s = s.substring(0, 22) + s.substring(23);  // to get rid of the ":"
    } catch (IndexOutOfBoundsException e) {
        throw new ParseException("Invalid length", 0);
    }
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
    Date date = df.parse(s);
    return date;
}