infinity interval

[Gerhard Heift <ml-postgresql-20081012-3518@xxxxxxxxx>]

Hello,

how can I store an infinity value into an interval? I want to store
offsets to a timestamp, and for some cases i need +infinity and
-infinity as result.

I want to make something like this:
SELECT now() + 'infinity'::interval;

This should return 'infinity'::timestamp.

Is it possible?

Thanks,
  Gerhard

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