Difference between suspensive time and resolutive time clause?

A suspensive time clause: is when the parties agree that the duty to perform is postponed until a determined or determinable date due to the pending event, and that this event is certain to happen. However, the exact date is unknown.

Example: A and B agree that A will pay a certain amount to B 90 days after C's death. (C's death is certain, but the exact date is uncertain. The duty to perform is then suspended until an uncertain, but determinable date)

A resolutive time clause: is when the parties agree that the obligations in the contract will be terminated upon a certain future time. This exact time is certain to happen, but the exact date is unkown.

Example: A and B agree to perform the obligations within the contract until B's death. Upon B's death, the contract is terminated. The event of B's death is certain, but the exact date is unknown.

Both must be mentioned within the contract upon conclusion in the contract.