but just writing 07071977
Check for Common patterns at java.text.SimpleDateFormat.
Test if your pattern is valid, on the Online SimpleDateFormat Test.
The Pattern and SecondaryPattern string of af:convertDateTime should respect the pattern syntax specified by the java.text.SimpleDateFormat.
Of course you can also define pattern property, instead of taking it from bindings, but it is better to define it in the UI hints of VO attribute and access it from bindings.
Most probably the pattern in the VO's attr UI hints follows the above pattern syntax, too. Although the available formats are defined in formatinfo.xml (under JDev system dir), other values are accepted (eg. I remember using "yyyy-MM-dd hh:mm:ss" which is not specified in the formatinfo.xml, but is a valid pattern).
- Didier's excellent post!