XML to Wordpress changes

Modify current "XML file to wordpress" script. We would like to add the following... Timezone post offset Need to insert current post date/time to wordpress as "post_date_gmt". Then make the "post_date" offset by +8 hours UTC. Keyword tagging Need the ability to apply a list of wordpress tags to a post if the tags appear in the post title or post content. The list of tags would be specified by us in the script.