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+```
+% pandoc -f biblatex -t markdown -s
+Note that current CSL doesn't give us a way
+to distinguish between /open and /unknown,
+so item3-3 and item3-4 get parsed similarly.
+That should change in CSL 1.1, and then this
+test should be revised.
+
+@article{item3-3, date={1998/unknown}}
+@article{item3-4, date={1999/open}}
+@article{item3-10, date={2004-04-05T14:34:00}}
+@article{item5-1, date={0000}}
+@article{item5-2, date={-0876}}
+@article{item5-3, date={-0877/-0866}}
+@article{item5-5, date={-0343-02}}
+@article{item5-8, date={1723~}}
+@article{item5-9, date={1723?}}
+@article{item5-10, date={1723?~}}
+@article{item5-11, date={2004-22}}
+@article{item5-12, date={2004-24}}
+@article{item5-13, date={20uu}}
+@article{item5-14, date={y-123456789}}
+
+^D
+---
+nocite: '[@*]'
+references:
+- id: 'item3-3'
+  issued: 1998/
+  type: 'article-journal'
+- id: 'item3-4'
+  issued: 1999/
+  type: 'article-journal'
+- id: 'item3-10'
+  issued: '2004-04-05'
+  type: 'article-journal'
+- id: 'item5-1'
+  issued: 0000
+  type: 'article-journal'
+- id: 'item5-2'
+  issued: '-0876'
+  type: 'article-journal'
+- id: 'item5-3'
+  issued: '-0877/-0866'
+  type: 'article-journal'
+- id: 'item5-5'
+  issued: '-0343-02'
+  type: 'article-journal'
+- id: 'item5-8'
+  issued: 1723\~
+  type: 'article-journal'
+- id: 'item5-9'
+  issued: 1723
+  type: 'article-journal'
+- id: 'item5-10'
+  issued: 1723\~
+  type: 'article-journal'
+- id: 'item5-11'
+  issued: '2004-22'
+  type: 'article-journal'
+- id: 'item5-12'
+  issued: '2004-24'
+  type: 'article-journal'
+- id: 'item5-13'
+  issued: 2000/2099
+  type: 'article-journal'
+- id: 'item5-14'
+  issued: 'y-123456789'
+  type: 'article-journal'
+---
+
+
+```