Item.where("created_at > :date OR updated_at > :date", date: "2011-05-29")
> SELECT "items".* FROM "items" WHERE (created_at > '2011-05-29' OR updated_at > '2011-05-29')

attributes:
  created_at: 2011-05-29 16:07:10.664227
  updated_at: 2011-05-29 16:07:10.664229

Item.where("created_at > :date OR updated_at > :date", date: "2011-05-29 16:07:10")

mysql> SELECT '2011-05-30 12:00:00' > '2011-05-30';
+--------------------------------------+
| '2011-05-30 12:00:00' > '2011-05-30' |
+--------------------------------------+
|                                    1 |
+--------------------------------------+

some_date = Time.now
Item.where("created_at >= :date OR updated_at >= :date", date: some_date.tomorrow.beginning_of_day)

Post.after(date)