2 verses have
yawmaini
in Edition English Transliteration / Fussilat (Explained in detail)

41:9Qul a'innakum latakfuroona billazee khalaqal arda fee yawmaini wa taj'aloona lahooo andaadaa; zaalika Rabbul 'aalameen

41:12Faqadaahunna sab'a samaawaatin fee yawmaini wa awhaa fee kulli samaaa'in amarahaa; wa zaiyannassa maaa'ad dunyaa bimasaabeeha wa hifzaa; zaalika taqdeerul 'Azeezil 'Aleem