Dinosaurs were created on 6th day along with man. See Genesis 1:24-31.
The water dinos were on the 5th...........
I believe that’s when “ALL living things” were created. At least, according to THE Book.
Genesis 1:24
And God said, “Let the land produce living creatures according to their kinds: the livestock, the creatures that move along the ground, and the wild animals, each according to its kind.” And it was so. 25 God made the wild animals according to their kinds, the livestock according to their kinds, and all the creatures that move along the ground according to their kinds. And God saw that it was good.
26 Then God said, “Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals,[a] and over all the creatures that move along the ground.”
27 So God created mankind in his own image,
in the image of God he created them;
male and female he created them.
28 God blessed them and said to them, “Be fruitful and increase in number; fill the earth and subdue it. Rule over the fish in the sea and the birds in the sky and over every living creature that moves on the ground.”
29 Then God said, “I give you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food. 30 And to all the beasts of the earth and all the birds in the sky and all the creatures that move along the ground—everything that has the breath of life in it—I give every green plant for food.” And it was so.
31 God saw all that he had made, and it was very good. And there was evening, and there was morning—the sixth day.
Not so ... IF they had been created on the 6th day they would still be here... Those dinos existed in the land before time... They were destroyed in Genesis 1:2, what got translated 'before the foundation of the world' in Ephesians 1:4
4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
https://www.blueletterbible.org/lexicon/g2602/kjv/tr/0-1/ some seed planting for the curious.