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AS400 DAYOFWEEK(GENERAL DATE)

Posted on 2015-02-05
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Last Modified: 2015-02-07
Hi,

I want to use the DAYOFWEEK Function in an AS400 SQL call.  The date is currently  = 42041 (2/6/2015 or 20150206).

How can I use the DAYOFWEEK Function with this date format?

Otherwise how do I convert 42041 to 20150206?

Also is my terminology for 42041 (General Date) correct?  What should it be?

Thanks
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Question by:adb11a
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Expert Comment

by:daveslash
ID: 40592591
How does 2015-02-06 translate to 42041 ?
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Author Comment

by:adb11a
ID: 40592603
OBRGDT = 20150206

DAYS(DATE(SUBSTR(OBRGDT,1,4)||'-'||SUBSTR(OBRGDT,5,2)||'-'||SUBSTR(OBRGDT,7,2))) AS OBRGDT_1

You may ask why I don't just use OBRGDT but it is too long a story (presenting data in Excel).

My other option is to convert 42041 to 20150206 if you know how to do that?
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Author Comment

by:adb11a
ID: 40592605
Sorry daveslash, should have READ:

CASE WHEN OBRGDT = 0 THEN 0  ELSE DAYS(DATE(SUBSTR(OBRGDT,1,4)||'-'||SUBSTR(OBRGDT,5,2)||'-'||SUBSTR(OBRGDT,7,2))) - DAYS('1/1/1900') + 2 END
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Expert Comment

by:PortletPaul
ID: 40592612
As you refer to DAYOFWEEK I'm assuming you are using DB2 so I'd like to propose this article for reading

DB2 Basics: Fun with Dates and Times

It has numerous examples of how date/times and related functions work in DB2,  including  current date

but I don't understand "The date is currently  = 42041"
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Author Comment

by:adb11a
ID: 40592632
If you open excel, type '=TODAY()', press enter then format the cell as 'General' you'll get 42041.

I need the date in this format for formatting purposes in Excel.  I just need to be able to either convet 42041 to 20150206 or use DAYOFWEEK(42041).

I looked at the site you showed me and no luck.  Still looking
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Expert Comment

by:PortletPaul
ID: 40592659
I'm confused.
Are you performing this calculation in DB2 (where you can use DAYOFWEEK)
or in Excel (where you can use WEEKDAY)
?

e.g. In Excel
=WEEKDAY(TODAY())

and
Excel will accept dates (e.g. 31/12/1900 or 12/31/1900 etc.) depending on your locale settings


If in DB2 you would pass a timestamp field into the function

SELECT DAYOFWEEK(current date)  FROM sysibm.sysdummy1

{+edit, a correction; incorrect use of weekday in line above}
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Accepted Solution

by:
daveslash earned 300 total points
ID: 40592661
Thank you for the learning experience. I never knew you could represent a DATE like that.

This works for me:

select date(42039 + days('1900-01-01')), 
       dayOfWeek(date(42039 + days('1900-01-01')))
  from sysibm.sysdummy1

DATE            DAYOFWEEK
2015-02-06              6

Open in new window


HTH,
DaveSlash
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Assisted Solution

by:PortletPaul
PortletPaul earned 200 total points
ID: 40592664
oh and "day zero" in Excel is 1900-12-31, add 42041 days to that and you arrive at 2015-02-06

i.e. enter 0 into cell now format that cell as a date in another cell add 42041 to that 0
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Expert Comment

by:PortletPaul
ID: 40592667
Excellent work! (learning experience for me also)

Cheers.

sorry for the cross posting, can be a bit confusing
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Expert Comment

by:daveslash
ID: 40594952
adb11a: did that solve your problem?
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Author Comment

by:adb11a
ID: 40595357
Hi deveslash.

Your suggestion of:

select date(42039 + days('1900-01-01')),
       dayOfWeek(date(42039 + days('1900-01-01')))
  from sysibm.sysdummy1

works for me.

Thanks and thanks to PortletPaul.
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