One day is as a thousand years does not point to the creation week. It describes the relative notion of time to a being not constrained by time. He knows the future well enough to publish prophecies for centuries and millenia ahead, from date of the prophecy to fulfillment because He exists at all times. "I Am" clearly states this. Yeshua, aka Jesus , states " Have you not read, that He who created them from the beginning made them male and female". If humanity was not made literally in the beginning, then Jesus was using erroneous wording to explain the truth. If they were created after thousands, millions, or even billions of years, "the beginning" would be considered a lie.
The word Yom along with darkness and light periods everywhere else in the Bible means what we would refer to as a 24 hour period.
Notice the order of the creation week as contained within the KJV:
Day 1: let there be light - no sun and no moon, just light.
Day 2: sky and water.
Day 3: dry land, sea and plants.
Day 4: the sun, moon, and the rest of the stars.
Day 5: creatures of the air and sea.
Day 6: animals and humanity.
This is told as historical narrative, not in a metaphorical context.
The "second creation account" is commonly misunderstood as it provides detail to creation. Chapter 1 covers creation in broad strokes while the first few verses of chapter 2 provide details about the creation of man and woman, where they lived and God's instructions to them.
There is no way to accurately sandwich millenia in the creation account.