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Prepositions with the genitive: time
ὥστ᾽ οὔτε νυκτὸς ὕπνον οὔτ᾽ ἐξ ἡμέρας | ἐμὲ στεγάζειν ἡδύν
‘’ (Soph. El. 780-781)
The preposition ἐπί with the genitive signals a point in time. Less frequent are ἐκ (poetic) and μετά (very rare).
Some fixed expressions: ἐκ νυκτῶν ‘during the night watch’, ἐπὶ τῶν προγόνων ‘in the time of our ancestors’ etc.