st: querying format for programming

["E. Paul Wileyto" <epw@mail.med.upenn.edu>]

I need to convert the new date/time format (%tc) to the old standard 
(%td).  However, I need to make sure I don't apply the conversion to 
non-%tc formats.  (Bad things happen.)  Is there a function that queries 
a variable and returns the format (so that I can capture it as a macro)?

Thanks

Paul


--
E. Paul Wileyto, Ph.D.
Assistant Professor of Biostatistics
Tobacco Use Research Center
School of Medicine, U. of Pennsylvania
3535 Market Street, Suite 4100
Philadelphia, PA  19104-3309

215-746-7147
Fax: 215-746-7140
epw@mail.med.upenn.edu
http://mail.med.upenn.edu/~epw/ 
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