How to convert from ifs date format to sql based dates

Question

I want to write a sql query using dates, to search an ifs
database. Ifs stores dates as numbers created using the
java.util.Date class. These dates are accurate to seconds.
PLSQL uses a different format.
What I need is a PLSQL function that converts PLSQL date format
to and from the java.util.date format.
This is an example of what I would like to do.
String classname = "DOCUMENT";
String whereclause = "CREATEDATE > theNeededFuction(to_date('01-
Jan-2001', 'DD-Mon-YYYY'),'j')";
Selector mySelector = new Selector(login.getSession());
mySelector.setSearchClassname(classname);
mySelector.setSearchSelection(whereclause);
I do realize that I could simply convert the date in java, but
in the long run, I want to use the oracle tools that support
busness day calulations.
-Mitch

Answer 1

Hi Mitch - our ViewSpecification functionality automatically
includes an Oracle Date column, which is derived from the java
date values we store. These views are the supported way of
performing read-only operations against an iFS instance.
For yor reference, the Oracle date column is derived using the
following SQL operation (e.g. for createdate):
to_date('01-JAN-1970', 'DD-MON-YYYY') + (createdate/86400000)
regards,
dave