XML at UNC: Single and Normal Dates
We have attributes for inclusive dates (e.g., <unitdate type="inclusive">) and bulk dates (e.g., <date type="bulk">). With EAD 2002, the single date attribute went away. If you need to tag a single date, use the appropriate tag without a type attribute (e.g., <date>, <unitdate>). If you've got a collection-level single date, see Modifying Template-Generated Date Information.
We normalize dates at the collection and series levels.
The pattern for normalized dates is: yyyymmdd. In most cases, you'll find that pattern replicated where it should be used (<eadheader> and <unitdate> elements at the collection and <c01> levels only in the <archdesc>). Fill in only the relevant parts.
Here are some examples:
|Single Human Date||Single Normal Date|
|15 December 1946||19461215 (no slash)|
|July 2003||200307 (no slash)|
|Range Human Dates||Range Normal Dates|
|15 December 1946-4 July 2003||19461215/20030704|
|December 1946-July 2003||194612/200307|
|1861-1867, 1901, 1908||1861/1908|
Note the last three examples. Normalized dates can't accommodate "circa" or "s" or other modifiers. There also can't be more than a beginning date or a beginning and ending date. See Modifying Template-Generated Date Information for how to handle dates that are abnormal for normalization.
In most cases, use only the year(s) at the collection level (e.g., Mena Washington Diary, 1863-1864) and more specific dates in at the <c01> level (e.g., Mena Washington Diary, 1 December 1863-3 May 1864) and normalize accordingly (e.g., 1863/1864 and 18631201/18640503).
Undated, of course, is normal, but requires no normalization. Fun, huh? Aren't we glad that only top-level dates are normalized?