What is the ruling on an oath of divorce that occurred after a period of time was specified by the statement "until Saturday," without clearly defining the intention regarding Saturday's inclusion within the period, and is the oath considered restricted to this period if the condition was not mentioned immediately after the oath, knowing that there was an intention to specify the period before the oath?

Since you intended to prevent your wife from going out until Saturday, your oath is bound by that, because intention specifies the general and restricts the absolute in an oath.

As for breaking the oath (hanath) by her going out on Saturday: If there was no specific intention regarding Saturday, then the determining factor is the "reason for the oath." If the reason for the oath necessitates the inclusion of Saturday, then you would break the oath by her going out on that day; otherwise, not. If there was no specific reason for the oath, or if the reason did not specify the duration of the prohibition, then the reference point is the apparent meaning of the wording. The apparent meaning of the wording does not include Saturday in the prohibition, based on the majority opinion that the limit (ghāyah) does not enter into what is limited (mughayyā). Consequently, you would not break the oath by her going out on Saturday.