Group by day from timestamp

Question

In my posts table, it saves timestamp for each post record.

What query can group posts by day, using this timestamp column?

Answer 1

SELECT DATE(timestamp) AS ForDate,
        COUNT(*) AS NumPosts
 FROM   user_messages
 GROUP BY DATE(timestamp)
 ORDER BY ForDate

This found for me. I have timestamp like "2013-03-27 15:46:08".