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045 - TIME PERIOD OF HEADING (NR)
A time period code (subfield $a) and/or a formatted time period (subfield $b or $c) associated with the 1XX heading in an established heading record or 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
Multiple $b and/or $c subfields are present; each contains a formatted date/time.
- 2 - Range of dates/times
Two $b and/or $c subfields are present and together express a range of dates and/or times.
- Second - Undefined
- # - Undefined
Subfield Codes
- $a - Time period code (R)
A four-character alphanumeric code derived from the "Time Period Code Table" for B.C. and C.E. time periods. The 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)
A 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)
A 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 Control Subfields
- $8 - Field link and sequence number (R) See Control Subfields
Examples
045 |
##$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 |

