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Cannot cast as datetime

Posted on 2009-03-31
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Last Modified: 2012-05-06
I have a date field that I need to cast to datetime.  However when I do isdate on that field a get a few hundred rows that are like 2/31/2009 it's in the format I want just it obviously isn't a real date.  I tried creating the code below to subtract 3 days from the date, but I'm still getting the error The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.  Is there a different way to do this?
select case when isdate(DateOpened) = 1 then cast(DateOpened as datetime)
		else datediff(d,DateOpened, - 3) end as InvoiceDate
from Strat_Customers.dbo.Customer_guard

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Question by:N R
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by:reb73
ID: 24032292
Insert this line before the select statement and retry -

SET DATEFORMAT MDY
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by:N R
ID: 24032303
nope still same error
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by:ralmada
ID: 24032319
>>datediff(d,DateOpened, - 3)<<
should be
dateadd(d, -3, DateOpened).
But either way, it will not work because 2/31/2009 is not a valid date. There is no February 31.
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by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 50 total points
ID: 24032342
the problem is that the CAST() will be evaluated also when the isdate() returns false.

also, in the ELSE you use datediff() with dateopened as datetime value implicitly converted.

so, please clarify the expression's requested result.

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by:N R
ID: 24032371
In the end I need it to be a legit datetime for my stored procedure to work correctly.  Of the few hundred that are out of range values I wanted to subtract 3 days off of them, then they will all be within range.  I didn't know how to accomplish, but above is what I had tried.
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by:BrandonGalderisi
BrandonGalderisi earned 50 total points
ID: 24032397
Also, I think instead of:

else datediff(d,DateOpened, - 3) end as InvoiceDate


you want:

else dateadd(d,-3,DateOpened) end as InvoiceDate

Once you get the other stuff working.  But as angel stated, you won't be able to dateadd() anything with '2/31/2009' because that's not a valid date.  You will need to cleanse your data.
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by:ralmada
ID: 24032418
I'm glad Brandon that you agreed with what I've posted above in comment 24032319
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by:BrandonGalderisi
ID: 24032474
Don't flatter yourself into thinking I copied your answer.  It wasn't there when I posted the comment.
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by:ralmada
ID: 24032547

>>It wasn't there when I posted the comment.<<
that's weird, because you were able to see Angel's comment. :)

Anyhow, Peace man!
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by:ralmada
ID: 24032671

Gallitin,
If the invalid date is with Feb 31 only, then I was thinking maybe you could try something like this:
select case when isdate(DateOpened) = 1 then cast(DateOpened as datetime)
		else cast(replace(DateOpened, '2/31/', '2/28') as datetime) end as InvoiceDate
from Strat_Customers.dbo.Customer_guard

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by:ralmada
ID: 24032682
sorry missed one /
select case when isdate(DateOpened) = 1 then cast(DateOpened as datetime)
		else cast(replace(DateOpened, '2/31/', '2/28/') as datetime) end as InvoiceDate
from Strat_Customers.dbo.Customer_guard

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by:N R
ID: 24032700
No it happens to be many dates I just figured out that the customer data every month has 31 days for some reason so most months will have bad data.  Working on a function for it right now, but taking some time stumbling thru it.
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by:reb73
reb73 earned 50 total points
ID: 24032713
Can you not use a filter in the where clause to ignore invalid dates?

where isdate(DateOpened) = 1
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by:N R
ID: 24032731
Well I don't want to b/c it's a invoice date and each invoice has to have one.  The column it eventually inserts into doesn't allow nulls and it shouldn't, so I'm trying to build a function to call in the select that will look and see how many days the month should have and then change the date to the last legit day of that month
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by:ralmada
ID: 24033253
It might not be efficient, but you can give it a try to this:
select 	case when isdate(DateOpened) = 1 then cast(DateOpened as datetime)
	else 
		case when left(DateOpened, charindex(DateOpened, '/') - 1) = 2 then cast('2/28' + right(DateOpened, 5)) as datetime)
		else cast(replace(DateOpened, '/31/', '/30/') as datetime) end
	end as invoicedate
from yourtable

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by:N R
ID: 24033265
Data is stored in this format with no /

20090231
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N R earned 0 total points
ID: 24033403
Well working now I'll post up the function just in case it will help anyone searching for an answer:
/******************************************************************************
Purpose: 
 
 
Maintenance History:
Date:		Name:			Action:	
-------------------------------------------------------------------------------
03/31/2009	Nathan          	Created
******************************************************************************/
CREATE function dbo.F_FixDate_guard
(
	@Date varchar(255)
)
 
returns datetime
	
as  
begin 
 
set @Date = ltrim(rtrim(@Date))
 
if @Date = '00/00/00' 
	return null
 
declare @WorkingDate varchar(255)
 
set @WorkingDate = @Date
 
if substring(@Date,7,2) > 31 
	set @WorkingDate = substring(@Date,0,5) + substring(@Date,5,2) + '31'
 
if substring(@Date,7,2) > 30 and substring(@Date,5,2) not in (1,3,5,7,8,10,12)
	set @WorkingDate = substring(@Date,0,5) + substring(@Date,5,2) + '30'
 
if substring(@Date,7,2) > 28 and substring(@Date,5,2) not in (1,3,4,5,6,7,8,9,10,11,12)
	set @WorkingDate = substring(@Date,0,5) + substring(@Date,5,2) + '28'
 
return cast(@WorkingDate as datetime)
 
end

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by:ralmada
ralmada earned 350 total points
ID: 24033416
Ok, last try, dealing with leap year problem as well.
select 	case when isdate(DateOpened) = 1 then cast(DateOpened as datetime)
	else 
		case when substring(DateOpened, 5, 2) = 2 then 
				case   
					when left(DateOpened, 4)%400=0 then cast(convert(varchar(6), left(DateOpened, 6)) + '29' as datetime)
					when left(DateOpened, 4)%100=0 then cast(convert(varchar(6), left(DateOpened, 6)) + '28' as datetime)								when left(DateOpened, 4)%4=0 then cast(convert(varchar(6), left(DateOpened, 6)) + '29' as datetime)
					else cast(convert(varchar(6), left(DateOpened, 6)) + '28' as datetime) 
				end
		else cast(convert(varchar(6), left(DateOpened, 6)) + '30' as datetime) end
	end  as invoicedate
from yourtable

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by:BrandonGalderisi
ID: 24034199
I don't think http:#a24032397 needs to be included as it was already covered by ralmada.
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