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st: changing format


From   Nishant Dass <[email protected]>
To   STATA Help <[email protected]>
Subject   st: changing format
Date   Thu, 16 Oct 2008 12:16:54 -0700 (PDT)

Hi,

I am using Stata 10.0 for Windows and I have a small question about the "format" of variables:

I have several date variables that appear as string variables in my Stata dataset (reported as "31JAN2008", for instance):

              storage  display     value
variable name   type   format      label      variable label
-------------------------------------------------------------------------------
maturitydate    str9   %9s                    MaturityDate
offerdate       str9   %9s                    OfferDate


I need to find the duration between these two dates so I am trying to change them to a date format as follows:

. format maturitydate offerdate %td

But I get the following error: 

"string %fmt required for string variables"

Could someone tell how can I change string variables to dates? 

Thank you!

Nishant


      
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