When Jesus says, “No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father,” (Mark 13:32),
he is saying that determining the date is the Father’s responsibility, not that he has already set the date.
To borrow an analogy from Greg Boyd, the Father knows the hour of Christ’s return in the same way an earthly father knows when his daughter is old enough to date.
This doesn’t mean he has a date fixed in his mind; only that he’ll know when the right time has come.
In the same way a daughter can hasten that day by demonstrating maturity, so can the church also, according to 2 Peter 3, hasten the Lord’s return by obediently spreading the gospel.[6]
Many also point to messianic prophecies as a demonstration of God’s exhaustive foreknowledge of future events. Again, according to open theology,
God in his omnipotence can bring about whatever he wishes. If he desired to fulfill these messianic prophecies in Christ, he could have, with or without exhaustive foreknowledge of future events.
Prophecy and Its Place Within Open Theism | Garrett Ham