Do the devils know when a person will die and when Jesus (peace be upon him) will come?

Knowledge of the unseen is something God has exclusively reserved for Himself, and there is no way for creation to access it, except for a messenger whom He has approved. Revelation ceased with the death of the Prophet, peace and blessings be upon him.

Determining the time of a father's death is only from the knowledge of the unseen. However, if this occurs through a dream, it is possible, and a dream may or may not come true.

The timing of the Hour and the descent of Jesus, peace be upon him, are from the knowledge of the unseen that only God knows, and what is obligatory is to prepare for them by strengthening one's faith.

These inspirations you find may be from devils, and one must occupy themselves with the established texts of revelation.