Related Links
|
The content of this page has been reproduced with permission of the Library Of Congress |
045 - TIME PERIOD OF CONTENT (NR)
A 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 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 A.D. time periods. The 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)
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 $bd1975 |
045 |
2#$d186405 $bd186408 |
045 |
2#$c25000 $c15000 |
045 |
##$ad7d9 |
045 |
##$aa-c- |
045 |
##$ax-x- |
045 |
##$ad8h2 |
045 |
2#$ad7n6 $bc0221 $bd0960 |
045 |
2#$c225000000 $c70000000 |

