Some argue (usually in an effort to reconcile creation and evolution) that the seventh day of Genesis never ended, since the Bible does not state that there was an "evening" and a "morning" as it does for the first 6 days. However, we can be sure that the seventh day did in fact come to an end:

  1. Scripture tells us that on the seventh day, God rested, not that He is resting.
  2. God cursed the ground after the fall of man. If the seventh day never ended, this act would seem to contradict the fact that God made the seventh day holy.
  3. As noted here, the creation account's usage of the word yom very strongly indicates a 24-hour day.
  4. God's design for the sabbath is patterned after the 6 days of creation and seventh day of rest. If the seventh day never ended, then we would expect the sabbath to never end. Moreover, we should expect to never have to work in the first place, since we would be working on God's seventh day, which God said should be a day of rest.

So why doesn't Genesis mention an evening and a morning for the seventh day? Though we can't say for certain, note that the first 6 days are lumped together and described in very similar terms as the days in which God performed the creative process, and then there is a clear transition in the narrative in Genesis 2:1. The seventh day is spoken of using completely different terms from the first 6 days because it did not contain any of the creation process.