045 Subfield $b - Formatted 9999 B.C. through C.E. time period:
Subfield $b contains a specific time period formatted as yyyymmddhh, preceded by a code for the era (c for B.C.; d for C.E.). The era and year are required components; the month, day, and hour are optional.
era expressed as a code: c (B.C.); d (C.E.)
year expressed as a four-digit number (0000 to 9999) right justified; unused positions contain zeros
month expressed as a two-digit number (01 to 12) right justified; unused positions contain zeros
day expressed as a two-digit number (01 to 31) right justified; unused positions contain zeros
hour expressed as a two-digit number using the 24-hour clock (00 to 23) right justified; unused positions contain zeros
First indicator position values 0-2 specify whether the time period in subfield $b is a single date, multiple dates, or a range of dates. Each 9999 B.C. through C.E. time period associated with the heading is contained in a separate subfield $b.
Examples:
651 #0$aFrance$xHistory$yRevolution, 1791-1797.
045 2#$bd1791$bd1797
651 #0$aJapan$xHistory$yFebruary Incident, 1936 February 26)
045 0#$bd19360226
651 #0$aChina$xHistory$y221 B.C.-960 A.D.
045 2#$ad7n6$bc0221$bd0960
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