Thread: Date addition/subtraction

Hi

How in postgres can I do date/time subtraction or addition.
e.g. If I want to get today's date - 30 days? or current_timestamp - 1 hour?

Thanks
Craig

It's easy. You have to know that INTERVAL data type exist, so:

SELECT current_date - '30 days'::interval
SELECT current_timestamp - '1 hour'::interval

On Tue, 2005-05-03 at 12:32, Craig Bryden wrote:
> Hi
>
> How in postgres can I do date/time subtraction or addition.
> e.g. If I want to get today's date - 30 days? or current_timestamp - 1 hour?


select now()-interval'1 hour'

and so on.

On Tue, 2005-05-03 at 19:32 +0200, Craig Bryden wrote:
>
> How in postgres can I do date/time subtraction or addition.
> e.g. If I want to get today's date - 30 days? or current_timestamp - 1 hour?

easier than you think

select current_timestamp - interval '1 hour';
select current_date -interval '30 days';          -- timestamp
select current_date + interval '1 week';          -- timestamp
select date (current_date + interval '1 week');   -- date

see:
http://www.postgresql.org/docs/8.0/interactive/functions-datetime.html

gnari

Select current_timestamp - '30 day'::interval
Select current_timestamp - '1 hour'::interval


Thanks
Dinesh Pandey

-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Craig Bryden
Sent: Tuesday, May 03, 2005 11:02 PM
To: pgsql
Subject: [GENERAL] Date addition/subtraction

Hi

How in postgres can I do date/time subtraction or addition.
e.g. If I want to get today's date - 30 days? or current_timestamp - 1 hour?

Thanks
Craig


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