God created the earth during the first six days and celebrated it on Sabbath

Exodus 20:8-11

Remember the Sabbath day, to keep it holy. You shall labor six days, and do all your work, but the seventh day is a Sabbath to the LORD your God. You shall not do any work in it, you, nor your son, nor your daughter, your male servant, nor your female servant, nor your livestock, nor your stranger who is within your gates; for in six days the LORD made heaven and earth, the sea, and all that is in them, and rested the seventh day; therefore the LORD blessed the Sabbath day, and made it holy.