Kokzex Bøfguo-jit (International Mother Language Day) tagtafng ee 2-gøeh 21, si cidee kokzex-sexng ee zøehjit.
Kokzex Bøfgyjit si UNESCO ti 1999-nii 11-gøeh 17-jit zeateng`ee. Y ee bogtek si zuntiong bøfguo kab kokciorng gygieen ee swiong, thesag gygieen kab bunhoax ee tøgoaan tefngterng.