Is it possible to make a script that checks for example if a news articel is on the site for 2 weeks that it automaticly archive this?? Because know i have to check this my self every week. I hope that this is possible

When adding a news article, expand the "Archive" box, untick "Never archive" then select a date you'd like to archive the article. Once this date is reached it'll automatically archive it.

yes i know that but, now i have to tell every user thats they must do that, but if they forget that it's easy that a script checks it.

It is possible but you'll need to create the script yourself.