The flood described in the Bible started on the 17th day.
“In the six hundredth year of Noah’s life, in the second month, on the seventeenth day of the month, on that day all the fountains of the deep burst forth and the windows of the heavens were opened.” Genesis 7:11
Noah’s ark also came to rest on the seventeenth day. “and in the seventh month on the seventeenth day of the month the ark came to rest upon the mountains of Ararat.” Genesis 8:4