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Get DATE part of the DATETIME Expand / Collapse
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Posted Tuesday, February 5, 2008 7:11 AM


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DECLARE @TheDate DATETIME
SET @TheDate = '2008-02-05 23:59:59.997'
SELECT @TheDate
SELECT CAST(CAST(@TheDate-0.5000000385803 AS INT) AS DATETIME)
SET @TheDate = '2008-02-05 00:00:00.000'
SELECT CAST(CAST(@TheDate-0.5000000385803 AS INT) AS DATETIME)
;)

We're still on 2K, could be decades before we see 2K8


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For fast, accurate and documented assistance in answering your questions, please read this article.
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Post #451621
Posted Tuesday, February 5, 2008 9:00 AM
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it doesn't wait until noon to start rounding up...

DECLARE @TheDate DATETIME

SET @TheDate = '2008-02-05 11:59:59.993'
SELECT @TheDate
SELECT CAST(@TheDate AS INT)
SELECT CAST(CAST(@TheDate AS INT) AS DATETIME)

SET @TheDate = '2008-02-05 11:59:59.997'
SELECT @TheDate
SELECT CAST(@TheDate AS INT)
SELECT CAST(CAST(@TheDate AS INT) AS DATETIME)


bc
Post #451699
Posted Tuesday, February 5, 2008 9:25 AM


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DECLARE @TheDate DATETIME, @HalfDayAndaBit DECIMAL (14,13)
SET @HalfDayAndaBit = 0.5000000385803

SET @TheDate = '2008-02-05 11:59:59.993'
SELECT @TheDate
SELECT CAST(@TheDate-@HalfDayAndaBit AS INT)
SELECT CAST(CAST(@TheDate-@HalfDayAndaBit AS INT) AS DATETIME)

SET @TheDate = '2008-02-05 11:59:59.997'
SELECT @TheDate
SELECT CAST(@TheDate-@HalfDayAndaBit AS INT)
SELECT CAST(CAST(@TheDate-@HalfDayAndaBit AS INT) AS DATETIME)

That's where the 'AndaBit' comes in.


“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Post #451719
Posted Tuesday, February 5, 2008 9:59 AM
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If you don't care about the date coming back as an string. Then this is good solution too.

PRINT LEFT(getdate(), 11)
Post #451741
Posted Tuesday, February 5, 2008 2:24 PM


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or...

Select convert(char(10),getdate(),101)
Post #451899
Posted Tuesday, February 5, 2008 2:59 PM


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Thanks for a helpful article. Good discussion, too!

Julie
Post #451913
Posted Wednesday, February 6, 2008 2:56 AM


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James A. Lawrence (2/5/2008)
or...

Select convert(char(10),getdate(),101)

Of course I'd use convert(char(10),getdate(),103)...

Which raises a question I haven't found an answer to:

Why does America (and nowhere else) write dates in their traditional order, i.e. month/day/year?

Everywhere else has a date order which either goes from specific to general (day-month-year) or the reverse (y-m-d). Why does America use a medium-small-large (m-d-y) ordering such that a mechanical 'odometer' would have to update the middle section first, then the left end, then the right end rather than the more logical left-to-right or right-to-left?



Derek
Post #452082
Posted Wednesday, February 6, 2008 7:09 AM


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why am I getting times in the result for all of these, when I want only the date portion?

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Post #452180
Posted Wednesday, February 6, 2008 7:13 AM
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That'd be because the data type is dateTIME.
If you want just date, convert to SQL 2K8 and use a date only datatype, or as previous example above have done, convert to a char data type with only the date portion being returned.

Post #452182
Posted Wednesday, February 6, 2008 7:16 AM


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jcrawf02 (2/6/2008)
why am I getting times in the result for all of these, when I want only the date portion?


Curious - can you post what you've tried, with the results?


“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Post #452185
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