Actually take your Bible and read Genesis 1

HOW does each day begin?

“And God said…”

Underline that phrase in each verse. WHERE in the text does each day begin?

Circle the numbers of these verses with “And God said…”

We have verse 3, verse 6, verse 9 (&11)

Verse 14, verse 20, verse 24…

Thus, we have WHEN Each Day Begins in the Text

“And God said…”

“AND…” signifies a continuation; here, from a previous act of creation.
“Then God Said…”

Some versions translate “And” as “Then” which makes it more clear. Three modern versions just drop “And” thus taking away the context.

WHAT is the previous creative act prior to Day One– which begins in verse 3?

Verse 1: “In the beginning, God created the heavens and the earth.”

Verse 2 tells us the condition of this created Earth.

THUS we have an unknown period of time between the creation of (the beginning of) the universe in verse1, and the beginning of Day One, in verse 3, which begins the preparation of the newly created Earth for the creation of man.

The last condition in verse 2 is “darkness”

On Day 1 of preparing Earth for the creation of man, God dispels that darkness with light (verse 3).

[A note of interest—The Hebrew text uses cardinal numbers–one, two, three…for the days, not ordinal numbers– first, second, third…]

Now, you should be able to follow the exposition of Genesis 1, HERE

In The Beginning