Re: What's wrong with my date/interval arithmetic?

TL> It is not "exactly the same arithmetic", because to_timestamp
TL> delivers a result of type timestamp-with-time-zone, whereas your
TL> other values are evidently timestamp without time zone. You did
TL> not say what timezone setting you are using, but I think the
TL> discrepancy is probably explained by that.

I tried doing this: (casting to 'timestamp without timezone')

select cast(to_timestamp('2003-10-17 23:07:00','YYYY-MM-dd HH24:MI:SS') as timestamp)
+age(cast(to_timestamp('2003-12-01 03:50:45','YYYY-MM-dd HH24:MI:SS') as timestamp),
cast(to_timestamp('2003-10-17 23:07:00','YYYY-MM-dd HH24:MI:SS') as timestamp))

And it turns out you were right Tom, the result is
2003-12-02 03:50:45, so the data type _does_ matter.

Investigating that a little further I found out that there is a difference
in results returned by age:

select age(cast(to_timestamp('2003-12-01 03:50:45','YYYY-MM-dd HH24:MI:SS') as timestamp),
cast(to_timestamp('2003-10-17 23:07:00','YYYY-MM-dd HH24:MI:SS') as timestamp))
is '1 mon 14 days 04:43:45'

and

select age(to_timestamp('2003-12-01 03:50:45','YYYY-MM-dd HH24:MI:SS'),
to_timestamp('2003-10-17 23:07:00','YYYY-MM-dd HH24:MI:SS'))
is '1 mon 13 days 04:43:45'

But it still doesn't answer the questions why there is a difference in
results and why it is exactly one day.

The "timestamp without time zone" arithmetic should produce correct
results when all operations are done _within_ that data type (without
mixing types), yet I'm getting this one day discrepancy.

puzzled Wojtek