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Get last date of a given quarter

Posted on 2008-10-14
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Last Modified: 2009-06-23
I want to get the last date of a given quarter. The quarter is provided as an integer.

I was going down the road of using this SQL but doesnt seem to work:

SELECT DATEADD(m, 1, CONVERT(DATETIME, CAST(DATEPART(year, GETDATE()) AS varchar) + '-' + CAST(@Quarter * 3 AS varchar) + '-' + '01', 102)) AS DateQuarterEnd

I get the error: "String was not recognised as a valid date time"

Which is strange because all im doing is adding a month to the result of this query which does work:

SELECT CONVERT(DATETIME, CAST(DATEPART(year, GETDATE()) AS varchar) + '-' + CAST(@Quarter * 3 AS varchar) + '-' + '01', 102) AS DateQuarterStart
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Question by:g-spot
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18 Comments
 
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Expert Comment

by:Daniel Wilson
ID: 22710513
Well, I'm not getting that error for any quarter between 1 & 4.  I do find that it's actually giving the first date of the NEXT quarter, e.g. 2008-04-01 for Q1.

One more DateAdd gets it working here ...

SELECT DateAdd(d, -1, DATEADD(m, 1, CONVERT(DATETIME, CAST(DATEPART(year, GETDATE()) AS varchar) + '-' + CAST(@Quarter * 3 AS varchar) + '-' + '01', 102))) AS DateQuarterEnd

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Expert Comment

by:Kevin Cross
ID: 22710647
Daniel is correct.  The reason is you are taking the quarter say 3 and multiplying by 3 and casting as a date with a literal '01', so now you have 09/01/2008.  If you add a month, you are at 10/01/2008 by design.
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Author Comment

by:g-spot
ID: 22710932
Hi mwvisa and Daniel

Thanks for your advice.

Youre right, I am at 10/01/2008 by design. In fact I'm at 00:00 hours on 10/01/2008 which means i'm including all of 09/30/2008.

If I subtract one day then im at 00:00 on the 09/30/2008 which means I lose all that day.

I've just realised that my original code does work and the error message only appears in Visual Studio. The query works when run in Management Studio

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Daniel Wilson earned 504 total points
ID: 22710969
>>Youre right, I am at 10/01/2008 by design. In fact I'm at 00:00 hours on 10/01/2008 which means i'm including all of 09/30/2008.
To handle that, I usually subtract 1 second so I go through 9/30 11:59:59 PM.


SELECT DateAdd(s, -1, DATEADD(m, 1, CONVERT(DATETIME, CAST(DATEPART(year, GETDATE()) AS varchar) + '-' + CAST(@Quarter * 3 AS varchar) + '-' + '01', 102))) AS DateQuarterEnd

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Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 496 total points
ID: 22716406
I think you can simplify it:

SELECT DATEADD(QUARTER, @quarter, CAST(YEAR(GETDATE()) AS CHAR(4)) + '0101') AS DateQuarterEnd
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Expert Comment

by:Kevin Cross
ID: 22720680
I obviously don't use DateAdd to it's full potential as that is absolutely brilliant.  Gets you right to 10/01 and then you can combine with Daniel's suggestion of using DateAdd(s, -1, somedate) -- putting it together (Scott and Daniel's solutions):

DECLARE @quarter int
SET @quarter = 3

SELECT DATEADD(s, -1, DATEADD(QUARTER, @quarter, CAST(YEAR(GETDATE()) AS CHAR(4)) + '0101')) AS DateQuarterEnd
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Expert Comment

by:Scott Pletcher
ID: 22720812
Actually subtracting 1 second is not correct.  The problem is, for a DATETIME, it should be 3ms, for a SMALLDATETIME, one minute.

Of course that's a pain to do.  So the easiest thing is usually to instead use < than the next day.

For example, if I want all records for the current date, instead of this:

-- not recommended
WHERE columnDate BETWEEN CONVERT(CHAR(8), GETDATE(), 112) AND DATEADD(SECOND, -1, CONVERT(CHAR(8), DATEADD(DAY, 1, GETDATE()), 112))

-- recommended, if possible
WHERE columnDate >= CONVERT(CHAR(8), GETDATE(), 112) AND columnDate < CONVERT(CHAR(8), DATEADD(DAY, 1, GETDATE()), 112)


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Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 496 total points
ID: 22720887
CORRECTION:  re-edited comments from last posting to more accurately reflect what I was trying to say
:
This is a common and annoying problem.  Technically subtracting 1 second will not work.

For example, if you subtract 1 second, you get back to <yyyymmdd> 23:59:59.  But that means you will miss times between 23:59:59.003 and 23:59:59.997.

The problem is, for a DATETIME, it should be 3ms, for a SMALLDATETIME, one minute.  Of course that's a pain to do, and worse, the datatype could change.  So the cleanest thing is usually to instead use < than the next day.

For example, if I want all records for the current date, instead of this:

-- not recommended
WHERE columnDate BETWEEN CONVERT(CHAR(8), GETDATE(), 112) AND DATEADD(SECOND, -1, CONVERT(CHAR(8), DATEADD(DAY, 1, GETDATE()), 112))

-- recommended, if possible
WHERE columnDate >= CONVERT(CHAR(8), GETDATE(), 112) AND columnDate < CONVERT(CHAR(8), DATEADD(DAY, 1, GETDATE()), 112)
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Author Comment

by:g-spot
ID: 22721065

"The problem is, for a DATETIME, it should be 3ms, for a SMALLDATETIME, one minute.  Of course that's a pain to do, and worse, the datatype could change.  So the cleanest thing is usually to instead use < than the next day."

Which is basically what I was suggesting in the first place by getting the first day of the following quarter.
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Expert Comment

by:Kevin Cross
ID: 22721086
Agreed.  Personally, I will at times just say < the date I come up with and it being midnight covers me without including anything from the next day/quarter.
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Expert Comment

by:Kevin Cross
ID: 22721136
LOL, you sure did.  :) See Scott's post then on DateAdd with Quarter -- works exactly as needed.
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Expert Comment

by:Daniel Wilson
ID: 22721260
I'm usually actually using a BETWEEN statement ... and data from some sources are really date-only, e.g. 2008-10-15 00:00:00 -- which would be included in a BETWEEN that used the start of a day over as the upper bound.
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Expert Comment

by:Scott Pletcher
ID: 22721611
But BETWEEN includes the ending value, so you could get a value from the next day at precisely midnight.  For a SMALLDATETIME, that is a very real possibility, for a DATETIME, still possible, atlhough much less likely.
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Assisted Solution

by:Daniel Wilson
Daniel Wilson earned 504 total points
ID: 22721784
>> for a DATETIME, still possible, atlhough much less likely.

Assuming they are actual recorded Date/Times, that's true.  

But in many systems a date can be keyed in free-form and only the date is taken.  In many other cases dates are imported from legacy systems that have only the date (often as an 8-digit numeric field) and again, we end up with exactly midnight as the data in the SQL Server DB.


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Expert Comment

by:Scott Pletcher
ID: 22721820
Quite right, excellent point.  I hadn't thought about that.
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Expert Comment

by:Daniel Wilson
ID: 22721850
That's where we benefit from each others' experience.  I've profited from many of your answers & comments.
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Author Comment

by:g-spot
ID: 22732026
Thanks for all your help on this.

So if I wanted to get everything up to the end of the previous quarter I could use this:
SELECT * FROM Example WHERE EntryDate < DATEADD(QUARTER, DATEPART(QUARTER,DATEADD(m,-3,GETDATE())), CAST(YEAR(DATEADD(m,-3,GETDATE())) AS CHAR(4)) + '0101')

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