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If the last day of a period falls on a Sunday, a holiday as provided in the Act on National Holidays (Act No. 178 of 1948), or any other holiday, only when it is customary not to do business on the relevant day, the period expires on the immediately following day.
期間の末日が日曜日、国民の祝日に関する法律（昭和二十三年法律第百七十八号）に規定する休日その他の休日に当たるときは、その日に取引をしない慣習がある場合に限り、期間は、その翌日に満了する。
This names a provision as it read when this amending Act was made. It may have been amended since, so today's text can say something else. That is why it is not a link.This names a law that is not in this collection, so there is nothing here to open.We could not tell which provision this names, so it is not a link.