Harivamsha 48.13

48.13

tulyakālaṃ hi garbhiṇyau yaśodā devakī tathā
aṣṭamyāṃ śrāvaṇe māse kṛṣṇapakṣe mahātithau |
rohiṇyām ardharātre ca sudhāṃśor udaye tathā |
devaky ajanayad viṣṇuṃ yaśodā tāṃ tu kanyakām
muhūrte 'bhijite prāpte sārdharātre vibhūṣite //

For at the same time Yaśodā and Devakī were pregnant: / on the eighth lunar day in the month of Śrāvaṇa, on the great lunar day in the dark fortnight, / under the asterism Rohiṇī, at midnight, at the rising of the moon, / Devakī gave birth to Viṣṇu, and Yaśodā to that girl, / when the Abhijit hour had arrived, midnight being adorned.