According to Genesis, on what day of the month did the Flood begin?

According to Genesis, the Flood began on the seventeenth day of the second month. Genesis 7:11 gives the date while describing the bursting of the great deep and the opening of the windows of heaven.

The verse supplies both a month and a day, but the answer to this question asks for the day: the seventeenth. The biblical calendar’s ancient month system does not map neatly to one fixed modern calendar date, so the text should not be turned into a precise Gregorian date without additional assumptions.

This date is also distinct from later dates in the Flood account. Genesis says the Ark came to rest in the seventh month, and the waters had dried by a later stage in the narrative. The sequence of dates helps structure the story’s long chronology, rather than identifying a modern historical timestamp.