Searching datetime infos

From: Boris <koester(at)x-itec(dot)de>
To: pgsql-novice(at)postgresql(dot)org
Subject: Searching datetime infos
Date: 2000-12-30 10:09:22
Message-ID: 10127198909.20001230020922@x-itec.de
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Hello,

I am searching general informations about datetime calculations in
PGSQL. In the meantime I found a lot of interesting constructions like

... age('now',datum) > timespan('90 days'::reltime) ...

or

... 'now'::datetime - '90 days'::timespan ...

Are they anywhere any dox about this things in genereal????

--
Boris

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