WP displaying future post

I’m using wp 2.3.2 (recently upgrade from 2.2.1).

Even though i change the timestamp of the post, it will be published according to the timestamp previously set.

For example time now is 7.00 pm 31/1/2008. The particular post is set to be publish at 8 pm 31/1/2008. However before 8pm, i reedit the timestamp so that the post will be delayed to be publish on 9pm 2/2/2008. However when it’s 8pm, the post was published, and i check the Manage Post, it showed that the post will only be published on 9pm 2/2/2008. But it is shown at the blog at the time previously set.