MySql difference between two timestamps in days?

Question

How can I get the difference between two timestamps in days? Should I be using a datetime column for this?

---

I switched my column to datetime. Simple subtraction doesn\'t

Answer 1

If you need the difference in days accounting up to the second:

SELECT TIMESTAMPDIFF(SECOND,'2010-09-21 21:40:36','2010-10-08 18:23:13')/86400 AS diff

It will return
diff
16.8629