Incorrect dateTime.iso8601 value in the jabber-rpc request

[roman-sinelnikov]

The format of the value returned by the XMPPIQ+JabberRPC::+valueElementFromDate method in XEP-0009 extension is incorrect.

Date is formatted as follows:

  +(NSXMLElement *)valueElementFromDate:(NSDate *)date {
    unsigned calendarComponents =   kCFCalendarUnitYear | 
    kCFCalendarUnitMonth | 
    kCFCalendarUnitDay | 
    kCFCalendarUnitHour | 
    kCFCalendarUnitMinute | 
    kCFCalendarUnitSecond;
    NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:calendarComponents fromDate:date];

    NSString *dateString = [NSString stringWithFormat: @"%.4ld%.2ld%.2ldT%.2ld:%.2ld:%.2ld", 
                            (long)[dateComponents year],
                            (long)[dateComponents month],
                            (long)[dateComponents day],
                            (long)[dateComponents hour],
                            (long)[dateComponents minute],
                            (long)[dateComponents second], nil];

    return [self valueElementFromElementWithName:@"dateTime.iso8601" value: dateString];
}

BUT here http://xmpp.org/extensions/xep-0009.html
dateTime.iso8601 described as xs:dateTime type.

And here http://www.w3schools.com/schema/schema_dtypes_date.asp xs:dateTime type described as
string in 'YYYY-MM-DDThh:mm:ss' format.

I've noticed that server I'm working with returns an error when I try to send a request with such date value.