Automatic email notifications based on date in django

I have to implement a way to send automatic notification emails based on a model DateFields. I'll put an example.

I have a DateField with 2010-07-23 stored in it and I want django to send an email to开发者_StackOverflow a designated user when the current date reaches a week before (send it in 2010-07-16). Is there any way to accomplish this?

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You'll need to set up an external job, probably triggered via cron, that checks the date and sends the email as necessary.