Responsa על נדה 116:69

Q. A community summoned A to court and ordered that he answer the summons before a specified date, which date was extended to the first day of the (next) month, or be guilty of transgressing against a [community], solemn decree. Is the first day of the month included in the period given A to answer the summons of the community?
A. The community is entitled to consider the period given to A to answer its summons, as extending only up to, but not including, the first day of the month.
SOURCES: Pr. 825.