It’s not as simple as a day is only a 24 hour period. It’s much more complex than that:
http://godandscience.org/youngearth/longdays.html
Definition
Genesis 1:5 God called the light “day” and the darkness “night.” There was evening, and there was morning, marking the first day.
You obviously didn’t read the link, or are afraid of the Truth.
Read the link with an open mind, and pray for God’s wisdom and discernment.
Where did light come from if the sun and stars weren’t created until the fourth day? Without the sun, how would one calculate a “day”?