045 - Time Period of Content (NR)

MARC 21 Bibliographic - Concise

2007

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.

$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.

Examples


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

(02/20/2008)