NACO: Dates
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Princeton University Cataloging Documentation

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Give dates succinctly. Transcribe a non-Gregorian or old style/new style date as it appears, except that Western-style Arabic numerals are substituted for Oriental numerals, and non-Latin script words are romanized.

Include Gregorian equivalents of non-Gregorian dates according to the LC guidelines for your language. If month and day are given, use letter abbreviations of the month if the date expressed in all numerals would be ambiguous.