Declension table of ?sandhyātva

Neuter	Singular	Dual	Plural
Nominative	sandhyātvam	sandhyātve	sandhyātvāni
Vocative	sandhyātva	sandhyātve	sandhyātvāni
Accusative	sandhyātvam	sandhyātve	sandhyātvāni
Instrumental	sandhyātvena	sandhyātvābhyām	sandhyātvaiḥ
Dative	sandhyātvāya	sandhyātvābhyām	sandhyātvebhyaḥ
Ablative	sandhyātvāt	sandhyātvābhyām	sandhyātvebhyaḥ
Genitive	sandhyātvasya	sandhyātvayoḥ	sandhyātvānām
Locative	sandhyātve	sandhyātvayoḥ	sandhyātveṣu

Compound sandhyātva -

Adverb -sandhyātvam -sandhyātvāt