'First Day' in the Bible

And God called the light Day, and the darkness he called Night: and the evening and the morning were the first day.

And the waters decreased continually, till the tenth month: in the tenth month, on the first day of the month, were the tops of the mountains seen.

And it came to pass in the six hundredth and first year, in the first month, the first day of the month, the waters were dried from off the earth: and Noah removed the covering of the ark, and looked, and behold, the face of the ground was dry.