Declension table of ?prathamadivasa

Masculine	Singular	Dual	Plural
Nominative	prathamadivasaḥ	prathamadivasau	prathamadivasāḥ
Vocative	prathamadivasa	prathamadivasau	prathamadivasāḥ
Accusative	prathamadivasam	prathamadivasau	prathamadivasān
Instrumental	prathamadivasena	prathamadivasābhyām	prathamadivasaiḥ prathamadivasebhiḥ
Dative	prathamadivasāya	prathamadivasābhyām	prathamadivasebhyaḥ
Ablative	prathamadivasāt	prathamadivasābhyām	prathamadivasebhyaḥ
Genitive	prathamadivasasya	prathamadivasayoḥ	prathamadivasānām
Locative	prathamadivase	prathamadivasayoḥ	prathamadivaseṣu

Compound prathamadivasa -

Adverb -prathamadivasam -prathamadivasāt