863-865 $i-$m - Chronology:

Subfield $i-$m contain the hierarchical level of chronology that either appear on an item or that are used by reporting organization to record the receipt of an item. These chronology subfields are correlated with subfields $i-$m in the 853-855 Captions and Pattern field linked to the 863-865 field, although the same subfields need not always be present. Full correlation of the chronology level and the caption subfield $i-$m in linked 853-855/863-865 fields is not required when captions are not desired for displaying the holdings statement. Full correlation is required when compression or expansion of the field 863 or 864 chronology by computer algorithm is desired. If an applicable chronology level is lacking on the item, chronology may be invented and enclosed in brackets ( [ ] ).

Months and seasons may be expressed either in natural language or by the following codes:

A month code of less than two digits is right justified and the unused position contains a zero.

When an alternative chronology scheme is applicable to an item, subfield $m contains the alternative chronology. If more than one level of alternative chronology is required, and 866-868 Textual Holdings field is used.

When only chronology is used on an item (that is, the item carries no enumeration), the chronology is contained in the relevant enumeration subfield ($a-$h) instead of the chronology subfields ($i-$m).

$i First level of chronology

$j Second level of chronology

$k Third level of chronology

$l Fourth level of chronology

$m Alternative numbering scheme, chronology

See also:

863-865 Enumeration and Chronology - General Information