Date Arithmatic

[karanbikash]

Hi Group ,

Am new to DB2 . I am facing some problem with date arithmatics :

The current date as today is from the below sql :

db2 "select current date from sysibm.sysdummy1"

1
----------
04/24/2007

1 record(s) selected.

I want to check out the difference between todays date and an old date
'10/15/1999'
db2 "select current date - date('10/15/1999') from sysibm.sysdummy1"

1
----------
70609.

1 record(s) selected.

What does the output 70609 indicates ...Is it no of days ?? Not
possible .

Again I checked with the below query :

pads@ibmrgzng /home/padsdb2 "select date (current date -
date('10/15/1999')) from sysibm.sysdummy1"

1
----------
04/27/0194

1 record(s) selected.

What does the out put indicates ??
Can you please help me .

Best Regards
Bikash Karan

[Ian]

ka*********@gmail.com wrote:

Hi Group ,

I want to check out the difference between todays date and an old date
'10/15/1999'
db2 "select current date - date('10/15/1999') from sysibm.sysdummy1"

1
----------
70609.

It's called a date duration. It displays the difference in years,
months and days. So, in your example, it's 7 years, 06 months, 09 days.

[karanbikash]

On Apr 24, 11:52 am, Ian <[e-mail]:

[e-mail] wrote:

Hi Group ,
I want to check out the difference between todays date and an old date
'10/15/1999'
db2 "select current date - date('10/15/1999') from sysibm.sysdummy1"

1
----------
70609.

It's called a date duration. It displays the difference in years,
months and days. So, in your example, it's 7 years, 06 months, 09 days.

Thanks a lot ....and how about if I modify the query as

$db2 "select date(current date - date('10/15/1999')) from
sysibm.sysdummy1"

1
----------
04/27/0194

1 record(s) selected.
What does this format shows ??
Thanks a lot .

[Tonkuma]

date duration's actual data type is DECIMAL(8,0).
DATE function takes as its argument some different data types and the
result depend on the argument's data type, length and format(if
argument is a character string).
In this example argument is a number(calculated as date duration),
then DATE returns n-1 days after January 1, 0001.
There is another function DAYS which take arguments as date or
timestamp or character representation of them and returns days from
January 1, 0001.
------------------------- Commands Entered -------------------------
VALUES current date - date('10/15/1999');
-------------------------------------------------------------------

1
----------
70609.

1 record(s) selected.
------------------------- Commands Entered -------------------------
VALUES date(current date - date('10/15/1999'));
--------------------------------------------------------------------

1
----------
0194-04-27

1 record(s) selected.
------------------------ Commands Entered -------------------------
VALUES DAYS('04/27/0194');
-------------------------------------------------------------------

1
-----------
70609

1 record(s) selected.

If you want the days between '10/15/1999' and current date, you can
calculate as followings.
------------------------- Commands Entered -------------------------
VALUES DAYS(current date) - DAYS('10/15/1999');
------------------------------------------------------------------------

1
-----------
2748

1 record(s) selected.