पूर्वापरनिशयोर्द्वाभ्यां यामाभ्यां सह दिवसमद्यतन-कालस्तद्भिन्नोऽनद्यतनः ।
pūrvāpara-niśayor dvābhyāṁ yāmābhyāṁ saha divasam adyatana-kālas tad-bhinno’nadyatanaḥ |
(Vṛtti on Hari-nāmāmṛta-vyākaraṇa: 1060)
“Adyatana (“today”) refers to the day along with two yāmas [i.e. quarters] of the prior and latter nights. Anadyatana (“not today”) is that which is distinct from this.”