Yahweh is the reference for time

I'm reading the Bible in chronological order this year.

I've been contemplating the six days of creation.  I previously subscribed to the "young earth" perspective (i.e., that the earth was formed in six literal 24-hr days), but a number of years ago, I relaxed that position because the Hebrew word for "day" in Genesis 1 could also mean "age".  I think it is much more important to focus on the fact that Yahweh is the creator than exactly how much time it took based on Gen 1.

It occured to me over the past couple of days that the tricky point about 24-hr day versus "age" is that Yahweh created light on the first day, and He documented evening and morning in that first day.  But He did not create the sun until the fourth day.

So, what was the source of light on days 1 through 3? How could there be evening and morning on the first three days without the rising and setting of the sun?

After a week and a half of pondering, I eventually concluded that Yahweh is the reference for time.  He determines what a day is.

Father, you are the keeper of time.  You are eternal.  From my perspective within time, you are infinite in both directions of time; but actually, you are outside of time.  Timeless.  Teach me to number my days.  Jesus only had three years of ministry.  May my life be lived to the fullest.  I love you.