OCLC’s guidelines say that for “circa” you should use a range of 5 years before to 5 years after – will that work?


https://www.oclc.org/resources/research/activities/ead/bpg.pdf (p. 4, “Approximate dates”)




From: Encoded Archival Description List [mailto:[log in to unmask]] On Behalf Of Nathan Gibson
Sent: Wednesday, March 13, 2013 8:29 AM
To: [log in to unmask]
Subject: Approximate Dates


We have some approximate (circa) birth and death dates that we'd like to include for EAC persons, but at this time don't have sufficient data to specify @notBefore and @notAfter. Is there a way to include these in machine-readable form (standardDate) but somehow mark that they are approximate? What is the best practice?