[Plugin: Post Expirator] Custom Fields

Just attempting to use a custom field to add the date of expiration as I am using a form on the front-end to create custom posts. But there are a few issues.

1. the plugin database entry creates a strange date in the database for the meta, something like ‘1334943600’ , rather than 2012/04/20.

2. the plugin also creates the extra meta fields
-expiration-date-category
-expiration-date-processed

so are those two extra meta fields needed? and secondly whats with the date?

http://ww.wp.xz.cn/extend/plugins/post-expirator/