Programming the statistical procedures from SAS

cox proportional hazard model time variable

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cox proportional hazard model time variable

id drug  end_Date   enr_Date o_date
1   a      01/02/2005   04/02/2004  01/03/2003

I have the following database and I am trying to run cox regression. My question how to code the time component as day to the occurrence to the first of either end_Date, enr_date or o_date? 

Thanks 

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