code: func ParseDateTime(data string) (DateTime, error) {
  	if data == "" {
  		return NewDateTime(), nil
  	}
  	var lastError error
  	for _, layout := range dateTimeFormats {
  		dd, err := time.Parse(layout, data)
  		if err != nil {
  			lastError = err
  			continue
  		}
  		lastError = nil
  		return DateTime(dd), nil
  	}
  	return DateTime{}, lastError
  }
docs: // ParseDateTime parses a string that represents an ISO8601 time or a unix epoch