@9-10ths_Penguin I looked up classical replies, but they are not too convincing for me either.
I will try explain how I understand it. God's essence doesn't change but he creates his will, his will is emotionful and linked to him, and is his state, but when we change states, it effects our essence too. Our essence can change by actions and states, and they are related. God's essence doesn't change, but he is in every day in a state.
The state of a day we count (24 hours) takes a thousand years with God and some of if not all his Angels (a). It's not that time doesn't exist with God, it's that it doesn't change his essence, but his state and reaction and emotion does change. Time is not uniform.
In reality he is time. And future and past don't exist, only present. God creates his will and states, just as we do, but his essence doesn't change. I hope that makes sense.
Looking up explanations out there, I could see why they would not be convincing to many.
The two Angels Munkar and Nakeer for example slow time. It's not that time doesn't exist, it's just not uniform as we think.