More information and examples can be found in our article . The particulars are important, so let's look at what Genesis 1 says: Then God said, "Let the earth sprout vegetation, plants yielding seed, and fruit trees bearing fruit after their kind, with seed in them, on the earth"; and it was so.
Although some Christians claim the days of creation are exactly 24-hours in length, it is apparent from the literal reading of the Genesis 1 text that this is not so. And the earth brought forth vegetation, plants yielding seed after their kind, and trees bearing fruit, with seed in them, after their kind; and God saw that it was good.
In reality, the Bible makes no claim as to the age of the earth, although it does establish a minimum age.
This page examines some of the history of the controversy—what the Bible actually says and does not say—and the scientific evidence surrounding the age of the earth.
Although many Christians claim this makes the days exactly 24-hours in length, the Hebrew word translated "day" in English actually has three literal translations; the daylight portion of a 24-hour day, a 24-hour day, and a long, unspecified period of time (as in "day of the dinosaurs").