Can anyone explain this to me?
The first one seems quite wrong; the rest make perfect sense.
mysql> select ifnull(date('1900/5/3'), date('1900/01/01')) + 10000;
+------------------------------------------------------+
| ifnull(date('1900/5/3'), date('1900/01/01')) + 10000 |
+------------------------------------------------------+
| 11900 |
+------------------------------------------------------+
1 row in set (0.00 sec)
mysql> select ifnull(date('1900/5/3'), date('1900/01/01'));
+----------------------------------------------+
| ifnull(date('1900/5/3'), date('1900/01/01')) |
+----------------------------------------------+
| 1900-05-03 |
+----------------------------------------------+
1 row in set (0.00 sec)
mysql> select date('1900/5/3') + 10000;
+--------------------------+
| date('1900/5/3') + 10000 |
+--------------------------+
| 19010503 |
+--------------------------+
1 row in set (0.00 sec)
mysql> select date(date('1900/5/3') + 10000);
+--------------------------------+
| date(date('1900/5/3') + 10000) |
+--------------------------------+
| 1901-05-03 |
+--------------------------------+
1 row in set (0.00 sec)
(5.5.8 under muSoft Windows)
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