This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
Shan, I think this would be easier to do without using any special date functions in db2.
Your query could be something like: select employment_date from table where employment_date > ? and employment_date < ?
You can easily figure out the start and end dates in java (Calendar class.) It's platform independent and might also perform faster (being a simpler query.)