Genesis 1:5

"God called the light 'day,' and the darkness he called 'night.' And there was evening, and there was morning—the first day." Genesis 1:5 (NIV)

Here God names the light and darkness he separated.  It's curious that evening is listed before morning, we always think of morning being first in a day and evening being last.  Did God really order evening as the beginning of a day and morning at the end?  Or is this a grammar issue?  Apparently many cultures started their days at sunset including the Jews.  The Jews, of course, start their days at sunset following God's example from this verse.

I've seen no variations in translations.  They all agree with the way this translation reads.  The only discussion I really see is whether "the first day" meant an actual physical day or if it was a figurative day.  I don't see any reason this couldn't be an actual physical day, after all this is God creating.  With him all things are possible.  If he had wanted he could've snapped his fingers and caused the universe to come into being, but for whatever reason he took his time.  This day may have been longer than a 24-hour-day, I don't understand enough of the science behind it to argue one way or the other, but whatever the case, God is the one that created it.