You may also post entries that have there post date has passed. This is useful for those posts that you just forgot to post,posts work best in order.
To past date a post, create a post as normal but before submitting the post, find Publish Status in the Miscellaneous Options on the lower section of the post page. This option defaults to Publish Now.
Change Publish Now to Publish On and then choose the date and time that you wish for the post to appear to have been posted. If you select a date in the future, you will be creating a Pending post.