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