A resolutory period is a specific timeframe attached to an obligation or contract. The fulfillment of the obligation or termination of the contract happens upon the arrival of this period. It's important to understand that a resolutory period operates differently from a regular period or deadline. With a regular period, the obligation becomes due and must be fulfilled on a particular date. With a resolutory period, the contract comes to an end. Key Points (Based on the Civil Code of the Philippines): Article 1191 - Contracts with a resolutory period become effective at once but are terminated upon the arrival of the set period. Article 1192 - If the obligation of either party becomes impossible to fulfill (due to no fault of the parties), the obligation is extinguished. Article 1193 - In cases with a set period, the obligation only becomes demandable when that period arrives. However, there's the concept of a "day certain," a period that will undoubtedly happen, ev...