How to perform date operations in hibernate

Question

I want to perform data time operations using hibernate HQL.

I want to add and subtract two dates as well as I want to subtract 1 year or 1 month from a particular da

Answer 1

Postgres users...

registerFunction("dateadd", new SQLFunctionTemplate(StandardBasicTypes.DATE, "(?1 + INTERVAL ?2)"));

with SQL usage like:

now() < dateadd(:mydate, '-1 day')