On what day of the month did the flood begin in the Genesis account of Noah's Ark?

The flood began on the 17th day of the second month in the Genesis account of Noah's Ark.

Genesis 7:11 provides a specific date: on that day, the fountains of the great deep burst open and the windows of heaven were opened. Noah was 600 years old at the time, according to the narrative's chronological framework. The verse marks the start of the flood after Noah and the animals had entered the ark.

The account uses several dated milestones. The ark came to rest on the mountains of Ararat on the 17th day of the seventh month, and the ground was dry by the 27th day of the second month of Noah's 601st year. These dates help explain why the flood story is more than a simple statement that it rained for many days.

Different biblical passages and traditions organize calendars differently, but the date in Genesis 7:11 is explicit within the narrative itself.