Library of Congress >> MARC >> Bibliographic >> 01X-09X >> 045

045 - Time Period of Content (NR)

MARC 21 Bibliographic - Concise

Time period code (subfield $a) and/or a formatted time period (subfield $b and/or $c) associated with an item.

First - Type of time period in subfield $b or $c
# - Subfield $b or $c not present
0 - Single date/time
1 - Multiple single dates/times
Multiple $b and/or $c subfields are present, each containing a date/time.
2 - Range of dates/times
Two $b and/or $c subfields are present and contain a range of dates/times.
Second - Undefined
# - Undefined
Subfield Codes
$a - Time period code (R)
Four-character alphanumeric code derived from the "Time Period Code Table" for B.C. and A.D. time periods.
Table is found in MARC 21 Format for Bibliographic Data under the description of field 045.
$b - Formatted 9999 B.C. through C.E. time period (R)
Specific time period recorded in the pattern yyyymmddhh and preceded by a code for the era (c for B.C.; d for C.E.).
$c - Formatted pre-9999 B.C. time period (R)
Formatted time period that consists of as many numeric characters as are needed to represent the number of pre-9999 years B.C.
$6 - Linkage (NR)
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number (R)
See description of this subfield in Appendix A: Control Subfields.
045 ##$aa0d6
045 0#$c2500000000
045 1#$bd1972$bd1975
045 2#$bd186405$bd186408
045 2#$c25000$c15000
045 ##$ad7d9
045 ##$aa-c-
045 ##$ax-x-
045 ##$ad8h2
045 2#$ad7n6$bc0221$bd0960
045 2#$c225000000$c70000000

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