Yes, it is true, the sixth day is the last day where it is mentioned by evening and morning
31 And God saw every thing that he had made, and, behold,
it was very good. And the evening and the morning were the sixth day.
The next verse is in the next chapter and says:
1Thus the heavens and the earth were finished, and all the host of them.
2And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
3And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
So in reality we aren't sure exactly when he ended his work since it says that on the seventh day he ended it. Did he stop at sundown at the end of the sixth day? Did he continue through the night until the morning?
I'm not sure what you are saying here, are you saying that this isn't correct?
2 And on the seventh day God ended his work which he had made;
That he did no work, only spoke and that wasn't any work of His, the Creator?