use of date type fields

[Dan Swartz <dswartz@xxxxxxxxxxxxxxxxxx>]

We're embarking on some database design issues and I wanted to know how
others felt about the use of date type fields versus just numeric type
fields (format would be CCYYMMDD).  

What overhead (if any) would there be to convert numeric fields to date
type fields to do certain date interval calculations?

Any suggestions would be GREATLY appreciated.

Dan

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