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Persian NACO Manual

Dates for Classical Authors

Examples of many situations and treatments can be found in the NAF. A few rules seem to define current LC practice, as deduced from communications to us.
  1. If the piece in hand or reference source gives only Miladi dates, transcribe the years as given.
  2. Unless day and/or month are cited, whether in the piece in hand or in an outside reference source, a Hijri year is always to be transcribed in a heading as a choice of two Miladi years connected by "or" (except when a Hijri year falls entirely within one Miladi year). This practice is to be followed even if the piece in hand or reference source provides the Hijri date with a "corresponding" single Miladi date, as LC considers such correspondences, unless accompanied by days and/or months, to be mere "guesses."
  3. If the piece in hand and a reference source disagree on an author's dates, consult a third source (i.e., a second reference source) if available. If no third source can be found, or if the information from the third source does not "break the tie," cite all three sources and give the dates in the heading in a compromising form, using "?," "ca.," "fl.," "Xth cent." and Xth/Yth cent." as outlined in 22.17. A single "fl." year given by a reference source does not justify the use of any date in the heading, unless to resolve a conflict with another heading.
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