Reference for Bava Batra 328:6
בתר דשמעה מזונין סברה
[year]'!<span class="x" onmousemove="('comment',' This shows that Rabbi did not know that folded deeds were dated a year later than ordinary ones. How, then, could he raise the objection against R. Hanina, supra, which shows that he knew that the dating of one kind of deed was different from that of the other? ');"><sup>17</sup></span> — After he heard it from Zonin he knew it.<span class="x" onmousemove="('comment',' And it was then that he, raised the objection. ');"><sup>18</sup></span> In a certain [plain] deed there occurred the [following] date:<span class="x" onmousemove="('comment',' Lit., 'written'. ');"><sup>19</sup></span> 'In the year<span class="x" onmousemove="('comment',' Not specifying which year. ');"><sup>20</sup></span>