1. 1 month before 2014-01-07 (so the email will be send in 2013-12-07)
2. 2 weeks before 2014-01-07 (so the email will be send in 2 weeks before 2014-01-07)
3. 7 days before 2014-01-07 (so the email will be send in 7 days before 2014-01-07)
please help. thanks

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