date operations in jpql queries

Hi,

I have two questions regarding JPQL and operations on dates and times:

1)
I have a table where I store datetime intervals, like this: (dt_start,
dt_end). I want to find all intervals that contain given date, i.e.
those for which following inequality holds: dt_start <= given_date AND
given_date < dt_end. How to write such query in JPQL?

2)
How can I add some seconds to a date in JPQL? Can I build an
expression like that?

I'm using MySQL and I can write those queries in its SQL, so I could
use native queries, but I'd like to stick to JPQL, if possible.

Regards,

Mike

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