how to make email reminder if I have the expired date, for example 2014-01-07, and it will automatically send the email for reminding the user that their service will be expired in :
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1 month before 2014-01-07 (so the email will be send in 2013-12-07)
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2 weeks before 2014-01-07 (so the email will be send in 2 weeks before 2014-01-07)
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7 days before 2014-01-07 (so the email will be send in 7 days before 2014-01-07)
please help. thanks