Обсуждение: Dates

Hi Guys,

I am in troubles with some dates.


"I need to know the difference, in days, between two
dates."

Well, if the difference is less than a month, so I
could use:

SELECT date_part('day', age(now(), mydate));

But, when it is bigger than a month, the select above
return a wrong information to me:

For instance:

intranet=# select age('30/01/2004', '01/03/2004');
          age
-----------------------
 @ 1 mon 2 days 1 hour

So, if I use date_part(), it would return "2 days",
not "31 days", that is what I was waiting for.

How can I get the difference, in days, between two
dates???

Thanks in advance and
Best Regards,



______________________________________________________________________

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Subtracting two dates/timestamps will return an interval. So

select now()::date - '2004-01-13'::date

returns 34.

Is this what you need?

On Feb 16, 2004, at 2:01 PM, MaRCeLO PeReiRA wrote:

> Hi Guys,
>
> I am in troubles with some dates.
>
>
> "I need to know the difference, in days, between two
> dates."
>
> Well, if the difference is less than a month, so I
> could use:
>
> SELECT date_part('day', age(now(), mydate));
>
> But, when it is bigger than a month, the select above
> return a wrong information to me:
>
> For instance:
>
> intranet=# select age('30/01/2004', '01/03/2004');
>           age
> -----------------------
>  @ 1 mon 2 days 1 hour
>
> So, if I use date_part(), it would return "2 days",
> not "31 days", that is what I was waiting for.
>
> How can I get the difference, in days, between two
> dates???
>
> Thanks in advance and
> Best Regards,
>
>
>
> ______________________________________________________________________
>
> Yahoo! Mail - O melhor e-mail do Brasil! Abra sua conta agora:
> http://br.yahoo.com/info/mail.html
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 8: explain analyze is your friend
>
--------------------

Andrew Rawnsley
President
The Ravensfield Digital Resource Group, Ltd.
(740) 587-0114
www.ravensfield.com

On Mon, 16 Feb 2004, [iso-8859-1] MaRCeLO PeReiRA wrote:

> "I need to know the difference, in days, between two
> dates."

I think date difference will work, so maybe something like:
 CURRENT_DATE - mydate
which should return an integer.

> SELECT date_part('day', age(now(), mydate));

Hi Andrew, and other ones,

It was exactly what I was looking for!!

Thanks!!

Regards,

Marcelo

Ps.: This is the fastest and more efficient mailing
     list in the world. Congratulations to all.

 --- Andrew Rawnsley <ronz@ravensfield.com> escreveu:
>
> Subtracting two dates/timestamps will return an
> interval. So
>
> select now()::date - '2004-01-13'::date
>
> returns 34.
>
> Is this what you need?
>
> On Feb 16, 2004, at 2:01 PM, MaRCeLO PeReiRA wrote:
>
> > Hi Guys,
> >
> > I am in troubles with some dates.
> >
> >
> > "I need to know the difference, in days, between
> two
> > dates."
> >
> > Well, if the difference is less than a month, so I
> > could use:
> >
> > SELECT date_part('day', age(now(), mydate));
> >
> > But, when it is bigger than a month, the select
> above
> > return a wrong information to me:
> >
> > For instance:
> >
> > intranet=# select age('30/01/2004', '01/03/2004');
> >           age
> > -----------------------
> >  @ 1 mon 2 days 1 hour
> >
> > So, if I use date_part(), it would return "2
> days",
> > not "31 days", that is what I was waiting for.
> >
> > How can I get the difference, in days, between two
> > dates???
> >
> > Thanks in advance and
> > Best Regards,
> >
> >
> >
> >
>
______________________________________________________________________
> >
> > Yahoo! Mail - O melhor e-mail do Brasil! Abra sua
> conta agora:
> > http://br.yahoo.com/info/mail.html
> >
> > ---------------------------(end of
> > broadcast)---------------------------
> > TIP 8: explain analyze is your friend
> >
> --------------------
>
> Andrew Rawnsley
> President
> The Ravensfield Digital Resource Group, Ltd.
> (740) 587-0114
> www.ravensfield.com
>

______________________________________________________________________

Yahoo! Mail - O melhor e-mail do Brasil! Abra sua conta agora:
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