question: returns the date when the user left the conversation . concode_field_sep Date left concode_elem_sep String nickname concode_elem_sep Date joined concode_field_sep void participationEnded concode_elem_sep void writeExternal concode_elem_sep String getNickname concode_elem_sep void readExternal concode_elem_sep Date getJoined
target: Date function ( ) { return left ; }