God blessed the seventh day and made it holy

Genesis 1:26~2:3
God blessed man.
God saw all that he had made, and it was very good.
By the seventh day God had finished the work he had been doing; so on the seventh day he rested from all his work.
God blessed the seventh day and made it holy.
From first day to the sixth day there was evening and there was morning.
Why?
This is not a chronological(年的)account. The separations of the first three days create the spaces which God them fills. We are not told when creation took place. Nor are we given details as to how God brought the earth and life into being - nor how long it all took.
The storyteller does not share the preoccupations of a scientific age. He is concerned with more important things.
The seventh day God did not described evening and morning for God was rested so there is not assignment for time and works, it is running automatically.
The seventh day is holy day so other matter is not important.
How?
Holy day is a day to meditate the creation of God and his love and blessing for man.