For the source text click/tap here: Bava Batra 171
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R ’ Yehudah in a Baraisa rules that a document that was dated on Shabbos or Yom Kippur is valid because it is assumed to be a postdated document and not one that was actually written on Shabbos or Yom Kippur.
Rashbam (1) explains that the document was dated according to the solar calendar and when the corresponding Hebrew date was calculated it was discovered that it coincided with Shabbos or Yom Kippur. This touches upon the issue discussed in the Poskim whether it is permitted for a person to date his correspondence according to the gentile method of calculating the year or not.
We continue our analysis of debts loans and promissory notes ending with Chaim Soloveitchik’s 1194 opus RUPTURE AND RECONSTRUCTION: THE TRANSFORMATION OF CONTEMPORARY ORTHODOXY