Halakhah sur Guittin 2:8

Rav Senderovic then explores the possibility of dating the get as Tuesday, since a postdated get is acceptable according to Tosafot (Gittin 17a s.v. Reish Lakish) and the Rosh (Gittin 2:5). Indeed, this opinion is presented as the primary opinion in Shulchan Aruch (E.H. 127:9). Moreover, the get might be acceptable even according to the dissenting opinion of the Rambam (Hilchot Geirushin 1:25), since it would not be delivered until after the date written in the get (see Pitchei Teshuvah E.H. 127:14). However, since other opinions (cited ad. loc.) believe the get to be nonetheless invalid according to the Rambam, Rav Senderovic did not adopt this approach.