code: func (m Iteration) GetLastModified() time.Time {
  	lastModified := m.UpdatedAt // default value
  	// also check the optional 'RelationShipsChangedAt' field
  	if m.RelationShipsChangedAt != nil && m.RelationShipsChangedAt.After(lastModified) {
  		lastModified = *m.RelationShipsChangedAt
  	}
  	return lastModified
  
  }
docs: // GetLastModified returns the last modification time