Declension table of pūrvasara

Neuter	Singular	Dual	Plural
Nominative	pūrvasaram	pūrvasare	pūrvasarāṇi
Vocative	pūrvasara	pūrvasare	pūrvasarāṇi
Accusative	pūrvasaram	pūrvasare	pūrvasarāṇi
Instrumental	pūrvasareṇa	pūrvasarābhyām	pūrvasaraiḥ
Dative	pūrvasarāya	pūrvasarābhyām	pūrvasarebhyaḥ
Ablative	pūrvasarāt	pūrvasarābhyām	pūrvasarebhyaḥ
Genitive	pūrvasarasya	pūrvasarayoḥ	pūrvasarāṇām
Locative	pūrvasare	pūrvasarayoḥ	pūrvasareṣu

Compound pūrvasara -

Adverb -pūrvasaram -pūrvasarāt