Re: subtracting from a date

On 02/06/2014 09:25 AM, Jay Vee wrote:
> I have reviewed working with dates documentation but some things are not
> clear and I cannot get an example to work for what I need.
>
> I am passing a date into a stored function like '2013-04-01'
>
> The stored function accepts this string as a date type.
>
> Within the function, I need to:
> 1. subtract one year from this date into another date type
> 2. subtract one month from this date into another date type
> 3. subtract one day from this date into another date type
>
> Are there any examples of this? This is not a timestamp type, but a
> date type.

Something like this:

test=> select '2013-04-01'::date - interval '1 yr';
?column?
---------------------
2012-04-01 00:00:00
(1 row)

test=> select '2013-04-01'::date - interval '1 month';
?column?
---------------------
2013-03-01 00:00:00
(1 row)

test=> select '2013-04-01'::date - interval '1 day';
?column?
---------------------
2013-03-31 00:00:00

You did say what language you are using for the function so the
assignment will depend on that.

>
> thanks
>

--
Adrian Klaver
adrian(dot)klaver(at)gmail(dot)com