Kim 's birthday had been provisionally celebrated from 1976 on .
Birthday became a national holiday only in 1982 , two days after Kim became a member of the Politburo of the Workers ' Party of Korea .
Kim 's birthday had been provisionally celebrated from 1976 on , but it became a national holiday only in 1982 , two days after he became a member of the Politburo of the Workers ' Party of Korea .