What is God's relationship to time?
The classical answer is a variation of timelessness: God is outside of time. Aquinas affirms a version of time being spread out before God like a parade that he sees all at once.
A more recent answer is that God is temporal: He experiences time in ways similar to us and the future is still open; he does not inhabit the future.
Somewhere between are varying answers of God's relativity to time: God experiences time in a different way from us. Boethius said that if time is like a wheel, then we experience the wheel at the rim, but God experiences it at the centre.
My own take is the following. God is timefull. He contains all of time. If I could change Boethius' analogy, God is the wheel and time is the centre. Where God "touches" time, he experiences time and shapes and moulds history. Where he does not touch time, he contains it.
How do I arrive here? Via Einstein, we know that time and space are relative. At higher speeds, time slows and space shrinks. This means (and this is NOT an original illustration) that
if one twin flew in a space ship that travelled near the speed of light for a certain amount of time and then returned to earth, he would be younger than his other twin. Time proceeds at a slower pace at such high speeds. If the twin in the space ship had a high-powered telescope, he could look back and watch the events of his brother's life occur at a different speed than his brother can.
Let's expand this to God: God contains all of time, being beyond the boundaries it creates. He "sees" time proceed at a different pace. But God has also entered the created order, making himself subject to the boundaries of time/space by his Son and Spirit. The Son and Spirit are the persons of God who "touch" time, moulding and shaping it, drawing it to the conclusion God desires.
So, I think it best to say that God is timefull. He contains time and is not bound by it. But God also touches time in the Son and Spirit and therefore is involved in it and working to draw it to a purposeful conclusion.