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

In Hibernate/MySQL (at least) You can convert to and from a Unix Timestamp. Since the unix timestamp is an integer you can add an integer number of seconds to it.

FROM_UNIXTIME(UNIX_TIMESTAMP(date)+ (allowedTimeWindow*86400)) as deadline

It has limitations but it's a lot easier than the approaches above.