What is the ruling when a husband says to his wife, "You are divorced one month before Zayd arrives," and Zayd arrives after a month?

Primary text

The divorce takes effect before the month, as it is an immediate pronouncement of divorce following the initial contract. This view is held by Al-Shafi'i and Zufar. The rationale is that the husband pronounced divorce contingent upon a time frame, and the condition (the time frame) having occurred validates the pronouncement within that time, analogous to saying, "You are divorced one month before Ramadan." Al-Shafi'i and Zufar consider the initial statement as an immediate act qualified by the time frame, not a condition precedent for the act itself.