Aino Ben Yomo (Bitul and Blios #45 - Shulchan Aruch YD 103:5)

Aino Ben Yomo: General Halacha; Calculations; Not effective b'dieved; Rely on it l'chatchilah (hag'alah, 12 months). See seforim by Rabbi Cohen at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠www.kashrushalacha.com