A Day According to God

I was snooping around the Internet and found this:

Genesis 1:5 "And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day."

I always hear people saying that a "day" to God could mean anything, but it seems to me that, at least in this verse, a day to God is the same as a day to us.

What are your thoughts?

Well remember the bible has been translated from Hebrew, so you may not be able to reliably pick apart every word.