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

045 - Time Period of Heading (NR)

MARC 21 Authority - Concise

2007

Time period code (subfield $a) and/or a formatted time period (subfield $b or $c) associated with a 15X heading in an established heading record or a 18X heading in a subdivision record.

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

2 - 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 C.E. time periods.

Table is found in the MARC 21 Format for Authority Data under the description of field 045, subfield $a.

$b - Formatted 9999 B.C. through C.E. time period (R)

Specific time period formatted as yyyymmddhh, 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	##$ac4c6


045	##$ad8h2


045	2#$bd1791$bd1797


045	2#$c225000000$c70000000

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

(03/03/2008)