How Siebel CRM Handles Certain Date Formats

If you set DDD, DD/MM/YYYY as the display format on a date list column, then Siebel CRM displays the date with the expected format but you cannot update the date. If you attempt to update the date, then it displays an error that is similar to the following:

Can't convert formatted string to its internal representation. Please check if your 
data is in correct format.

The same situation occurs if you use the DDD/MM/YYYY format.