Declension table of ?śanivāsara

Masculine	Singular	Dual	Plural
Nominative	śanivāsaraḥ	śanivāsarau	śanivāsarāḥ
Vocative	śanivāsara	śanivāsarau	śanivāsarāḥ
Accusative	śanivāsaram	śanivāsarau	śanivāsarān
Instrumental	śanivāsareṇa	śanivāsarābhyām	śanivāsaraiḥ śanivāsarebhiḥ
Dative	śanivāsarāya	śanivāsarābhyām	śanivāsarebhyaḥ
Ablative	śanivāsarāt	śanivāsarābhyām	śanivāsarebhyaḥ
Genitive	śanivāsarasya	śanivāsarayoḥ	śanivāsarāṇām
Locative	śanivāsare	śanivāsarayoḥ	śanivāsareṣu

Compound śanivāsara -

Adverb -śanivāsaram -śanivāsarāt