We follow the Best Practices Guidelines by the RLG EAD Advisory group, which gives several examples for open date spans, approximate dates, undated material, etc. on pages 3-4 of the document.
http://www.rlg.org/rlgead/bpg.pdf
-Alison
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Alison Hinderliter - [log in to unmask]
Project Archivist
The Newberry Library
60 W. Walton St.
Chicago, IL 60610-7324
(312) 255-3694
> Any suggestions on the "best" date format (i.e. 2004-01-29) for the
> following?
>
> about 1900
> 1930's
> early 1900's
> late 1950s
> late 1800's - early 1900's
> 1891 or 1892
> 1930's or 1940's
> 1920s around World War I
> April 1984
> prior to 1908
> Spring 1973
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