According to Genesis, on which day of the second month did the flood begin in Noah’s time?

According to Genesis, the flood began on the seventeenth day of the second month in Noah’s 600th year.

Genesis 7:11 gives this unusually precise date, stating that the fountains of the deep burst open and the windows of heaven were opened on that day. The verse also identifies Noah’s age as 600 years, linking the calendar date to the patriarch’s chronology.

The account uses a sequence of dated and numbered intervals. Rain then fell for 40 days and 40 nights, the waters prevailed for 150 days, and the ark rested on the mountains of Ararat in the seventh month. These details allow readers to trace the flood’s progression within the narrative.

The exact calendar system behind the month references is not fully explained in the text, and interpretations of the chronology vary among traditions. The seventeenth day, however, is the date explicitly stated in Genesis 7:11.