045 - Time Period of Content (NR)
MARC 21 Bibliographic - Concise
2008
This is an ARCHIVED VERSION of the
2008 electronic edition of the MARC 21 Concise
Formats. Please see loc.gov/marc/concise/
for the most up-to-date version of the electronic MARC 21
Concise Formats.
Time period code (subfield $a) and/or a formatted time
period (subfield $b and/or $c) associated with an item.
Indicators
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.
$8 - Field link and sequence number (R)
Examples
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045 |
2#$ad7n6$bc0221
$bd0960 |
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045 |
2#$c225000000$c70000000 |
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