Background: Moments in time are best stored as number of miliseconds from the start of epoch. That's what we do in our DB. All time values are stored as 64-bit integers, and creating java.util.Date s from these is easy: new Date(l). Now comes the question: how do I handle this in EJB QL queries? In particular, I would like to do queries like, "show me the total value of all the invoices by month for the last twelve months, with reference to the East Coast timezone". I can easily do this by doing multiple queries: create a Calendar object, set a timezone, find the first and last instants of a month, do a query for that, and do all this in a for loop. Any other ways? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4100875#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...