G-d's calendar: 26th day, 1st month, year 5771

Genesis 6:6-8
And it repented YHWH that he had made man on the earth, and it grieved him at his heart. And YHWH said, I will destroy man whom I have created from the face of the earth; both man, and beast, and the creeping thing, and the fowls of the air; for it repenteth me that I have made them. But Noah found grace in the eyes of YHWH.

Matthew 24:36-37
But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only. But as the days of Noe were, so shall also the coming of the Son of man be.

We have no idea, not fully, how wicket the earth had become in just ten generations of humans. I can't imagine it being more wicked then, than now. G-d mad ea promise, a covenant, that there would never be a world wide flood again. Y'hshuwah said when it got that bad, He's coming back and that promise will also be kept!