The word dies is a fifth declension noun and as such is regarded to be feminine. In the order of nominative, accusative, genitive, dative then abalative cases in the singular form, dies declines as follows: dies, diem, diei, diei, die.
The word dies is a fifth declension noun and as such is regarded to be feminine. In the order of nominative, accusative, genitive, dative then abalative cases in the singular form, dies declines as follows: dies, diem, diei, diei, die.