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+```
+% pandoc -f biblatex -t markdown -s
+@comment{
+    - Dates
+    - Not included in tests:
+        - malformed dates and date ranges
+        - literal dates ("13th century"; not supported by biblatex)
+        - seasons (would have to come from parsing the issue field)
+        - uncertain dates (use "doubtfuldate" from biblatex-apa?)
+        - dates with single-digit day or month (not supported by biblatex)
+        - negative dates (not supported by biblatex)
+    - Note: biblatex supports years < 1000 but only if padded with leading zeros
+    - TODO:
+        - either biblio2yaml or, probably better, citeproc should strip leading zeros
+         from days and months (CSL can add leading zeros to its output, but not remove
+         them when they are in its input data)
+}
+
+@article{year-month-old,
+    Author = {Author, Al},
+    Journal = {Journal},
+    Month = aug,
+    Title = {Year and Month, bibtex style, supported by biblatex for backwards compatibility},
+    Year = {1999}}
+
+@article{year-month-new,
+    Author = {Author, Al},
+    Journal = {Journal},
+    Month = {08},
+    Title = {Year and Month, biblatex style; note that biblatex does not have a ``day'' field},
+    Year = {1999}}
+
+@article{dates,
+    Author = {Author, Al},
+    Date = {2012-12-13},
+    Eventdate = {2011-10-03},
+    Journal = {Journal},
+    Month = may,
+    Origdate = {1888-10-01},
+    Title = {Dates, default biblatex style; year, month to be ignored if date exists},
+    Urldate = {1999-05-23},
+    Year = {9999}}
+
+@article{date-ranges-different-years,
+    Author = {Author, Al},
+    Date = {1999-10-14/2010-01-23},
+    Eventdate = {1999-12/2000-01},
+    Journal = {Journal},
+    Origdate = {1888-01-02/1913-12-13},
+    Title = {Date ranges; different years},
+    Urldate = {2012-10-12/2013-01-31}}
+
+@article{date-ranges-same-year,
+    Author = {Author, Al},
+    Date = {1999-10-14/1999-10-15},
+    Eventdate = {1999-10/1999-11},
+    Journal = {Journal},
+    Origdate = {1888-01-02/1888-12-13},
+    Title = {Date ranges; same year},
+    Urldate = {2012-10-31/2012-11-01}}
+
+@article{date-ranges-open,
+    Author = {Author, Al},
+    Date = {1999-10-14/},
+    Eventdate = {1999-10/},
+    Journal = {Journal},
+    Origdate = {1888-01-02/},
+    Title = {Date ranges, open-ended},
+    Urldate = {2012-10-31/}}
+
+@article{dates-very-old,
+    Author = {Author, Al},
+    Date = {0712-12-13},
+    Eventdate = {0311-10-03},
+    Journal = {Journal},
+    Month = may,
+    Origdate = {0088-10-01},
+    Title = {Dates, year less than 1000},
+    Urldate = {0999-12-14}}
+
+^D
+---
+nocite: '[@*]'
+references:
+- author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  id: 'year-month-old'
+  issued: '1999-08'
+  title: 'Year and month, bibtex style, supported by biblatex for
+    backwards compatibility'
+  type: 'article-journal'
+- author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  id: 'year-month-new'
+  issued: '1999-08'
+  title: 'Year and month, biblatex style; note that biblatex does not
+    have a "day" field'
+  type: 'article-journal'
+- accessed: '1999-05-23'
+  author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  event-date: '2011-10-03'
+  id: dates
+  issued: '2012-12-13'
+  original-date: '1888-10-01'
+  title: 'Dates, default biblatex style; year, month to be ignored if
+    date exists'
+  type: 'article-journal'
+- accessed: '2012-10-12/2013-01-31'
+  author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  event-date: '1999-12/2000-01'
+  id: 'date-ranges-different-years'
+  issued: '1999-10-14/2010-01-23'
+  original-date: '1888-01-02/1913-12-13'
+  title: Date ranges; different years
+  type: 'article-journal'
+- accessed: '2012-10-31/2012-11-01'
+  author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  event-date: '1999-10/1999-11'
+  id: 'date-ranges-same-year'
+  issued: '1999-10-14/1999-10-15'
+  original-date: '1888-01-02/1888-12-13'
+  title: Date ranges; same year
+  type: 'article-journal'
+- accessed: '2012-10-31/'
+  author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  event-date: '1999-10/'
+  id: 'date-ranges-open'
+  issued: '1999-10-14/'
+  original-date: '1888-01-02/'
+  title: 'Date ranges, open-ended'
+  type: 'article-journal'
+- accessed: '0999-12-14'
+  author:
+  - family: Author
+    given: Al
+  container-title: Journal
+  event-date: '0311-10-03'
+  id: 'dates-very-old'
+  issued: '0712-12-13'
+  original-date: '0088-10-01'
+  title: 'Dates, year less than 1000'
+  type: 'article-journal'
+---
+
+
+```