God created our entire universe, but lives outside of it.
So yes, God created time from our perspective.
Think of it this way:
Imagine you are an online game developer. From the perspective of characters in the game and even players that just play the game from our world. Time started when the game was launched.
The same is true with God.
Real is something tangible, you can feel, see, hear, something you can interact with, ect. as opposed to just imagining something.
When you define real that way. A computer game is “real” you can see, hear, touch, and interact with your environment. You are not imagining playing a game ... you are actually playing the game, it's “really” happening, and thus it's “real”
BUT is it “as” real as real life? or more specifically what we think of as “real life” ? Of course not! playing a character in a computer game although real is not as real as real life. It's a pale approximation of what real life is like.
I believe the same is true with regards to heaven. This life only seems like “real life” because we have never known what the actual reality is, the reality that we experience in heaven.
We are like computer characters that have only ever existed in a computer game that's a pale approximation of reality, who have no idea, having never experienced it, what reality is actually like.
Once you understand all the above, you can see how time in this universe can be completely separate from time in heaven. THIS universe had a beginning. God created it, it has a launch date so to speak.
God created this universe the same way that Blizzard created World of Warcraft.