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IFLA Universal Bibliographic Control and International MARC Core Programme (UBCIM)UNIMARC Manual : Bibliographic Format 1994
APPENDIX E: Time Period CodeIntroduction
The purpose of the Time Period Code is to allow access to a range of materials covering a particular era or related to a particular date. In UNIMARC, the code is entered in field 661. The code was developed at the U.S. Library of Congress for use in the USMARC format and was originally called the Chronological Coverage Code.
The Time Period Code consists of four alphanumeric characters assigned according to the tables given below. For B.C. dates, a lowercase alphabetic character represents the millennium and a digit represents the century. If the century is not known, a hyphen '-' is used instead of a number. For A.D. dates, a lowercase alphabetic character represents the century and a digit represents the decade. If the decade is not known, a hyphen is used instead of a number. If a single year or a period within a decade is recorded, the appropriate two-character code is repeated to create the four-character code.
B.C. TABLE A.D. TABLE
1 - 99 d9 2000 - y
In the B.C. table, the letter equals the millennium and the number equals the century. In the A.D. table, the letter equals the century and the number, which must be added, equals the decade.
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