Get DATE part of the DATETIME

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Get DATE part of the DATETIME

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Julie Breutzmann Hall of Fame Points: 3637 More actions · Answer 1

Thanks for a helpful article. Good discussion, too!

Julie

StarNamer SSCrazy Eights Points: 8746 More actions · Answer 2

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

jcrawf02 SSC-Insane Points: 24198 More actions · Answer 3

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

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"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."

Sean Walker Right there with Babe Points: 756 More actions · Answer 4

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.

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 5

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

jcrawf02 SSC-Insane Points: 24198 More actions · Answer 6

I understand the datatype of DATETIME, but thought the point was to truncate the value to just the date, and not give me 00:00:00 at the end. I'm not going to be able to convert to 2K8 anytime soon at work (not up to me, I'm low man on the totem pole)

Here's what I tried, and what I got:

SELECT [DateOnly] = CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME) -- CAST / FLOOR / CAST (RESULTS: 2008-02-06 00:00:00.000)

SELECT [DateOnly] = dateadd(dd,datediff(dd, 0, getdate()), 0) -- DATEADD / DATEDIFF (RESULTS: 2008-02-06 00:00:00.000)

SELECT [DateOnly] = CAST(CAST(GETDATE() AS INT) AS DATETIME) -- CAST / CAST(RESULTS:2008-02-06 00:00:00.000)

SELECT [DateOnly] = CAST(CONVERT(CHAR(8), GETDATE(), 112) AS DATETIME) -- CAST / CONVERT(RESULTS:2008-02-06 00:00:00.000)

Select [DateOnly] = convert(char(10),getdate(),101) --char version, this is the only one that gives me the correct results (RESULTS:02/06/2008)

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How best to post your question[/url]
How to post performance problems[/url]
Tally Table:What it is and how it replaces a loop[/url]

"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."

jcrawf02 SSC-Insane Points: 24198 More actions · Answer 7

Because we just have to be different. I'm going to go get my 'twelve barley-corns, round and dried' to measure something now . . .

---------------------------------------------------------
How best to post your question[/url]
How to post performance problems[/url]
Tally Table:What it is and how it replaces a loop[/url]

"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 8

jcrawf02 (2/6/2008)
Because we just have to be different. I'm going to go get my 'twelve barley-corns, round and dried' to measure something now . . .

Nah, pretty sure it was removing the time portion so the remainder - the date - is easier to work with.

'twelve barley-corns, round and dried' - what does this mean then?

^{“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

Sean Walker Right there with Babe Points: 756 More actions · Answer 9

I had gathered that what you hoped was that you could remove the 00:00:00.000 from the result, but as I stated, with a datetime data type, you'll always get the time, even if it's 00:00:00.000.

To remove the 00:00:00.000, you either need a date only datatype (which is only available starting with 2K8) or to change to the char datatype (which you did in your last example). BTW, please note in that last example, it isn't a date, it's a string.

The point of this wasn't to remove the time portion as in the 00s but just to truncate the time so that the result is easier to work with.

e.g. Select xx from SalesOrders where OrderDate >= FLOOR(CAST(GETDATE() AS FLOAT))

bc_ Hall of Fame Points: 3168 More actions · Answer 10

re: Derek's question about America's ordering of the date

http://en.wikipedia.org/wiki/Calendar_date

"In British English, full dates are usually written and spoken as 7th December 2007 (or 7 December 2007) and pronounced "the seventh of December", with the odd usage of December 7, 2007 ("December the seventh, 2007"). In common with continental European usage, however, numerical dates are invariably ordered dd/mm/yy(yy).

In the United States and Canada, the usual written form is December 7, pronounced "December (the) seventh" or colloquially "December Seven"."

[font="Arial Narrow"]bc[/font]

jcrawf02 SSC-Insane Points: 24198 More actions · Answer 11

Chris Morris (2/6/2008)
jcrawf02 (2/6/2008)
Because we just have to be different. I'm going to go get my 'twelve barley-corns, round and dried' to measure something now . . .
Nah, pretty sure it was removing the time portion so the remainder - the date - is easier to work with.
'twelve barley-corns, round and dried' - what does this mean then?

Original definition of the length of an American foot (roughly .3 meters)

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How best to post your question[/url]
How to post performance problems[/url]
Tally Table:What it is and how it replaces a loop[/url]

"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."

StarNamer SSCrazy Eights Points: 8746 More actions · Answer 12

jcrawf02 (2/6/2008)
Chris Morris (2/6/2008)
jcrawf02 (2/6/2008)
Because we just have to be different. I'm going to go get my 'twelve barley-corns, round and dried' to measure something now . . .
Nah, pretty sure it was removing the time portion so the remainder - the date - is easier to work with.
'twelve barley-corns, round and dried' - what does this mean then?
Original definition of the length of an American foot (roughly .3 meters)

No, According to http://en.wikipedia.org/wiki/English_unit a barleycorn is 1/3 of an inch. So 'twelve barley-corns, round and dried' is about 4 inches or 1 hand. 3 hands = 1 foot.

I still prefer the light-nanosecond as a unit for measure (about .3 meters).

Derek

Mohammad Mazharuddin Ehsan SSCarpal Tunnel Points: 4552 More actions · Answer 13

Thanks for info Jano Petras,

Internally - datetime is just 8-byte FLOAT number as stored by SQL Server

Could you provide the same info about the datatypes DATE & DATETIME2 in the proposed SQL Server 2008.

I am asking this because of limitation of the datetime type in SQL Server 2005 not to accept dates outside the date range from January 1, 1753 and December 31, 9999

The below SQL will result error in SQL Server 2005

SELECT CAST(FLOOR(CAST(cast('1752-12-31' as datetime) AS FLOAT)) AS DATETIME)

Best regards,

Maz

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Sean Walker Right there with Babe Points: 756 More actions · Answer 14

The reason 1752 dates throw an error, is that it was during this timeperiod that the British empire switched to the Gregorian calendar. During 1752 there was no Sept 3-13th. For this reason, I assume, Microsoft doesn't allow anything before 1753 as their cut off.

Mohammad Mazharuddin Ehsan SSCarpal Tunnel Points: 4552 More actions · Answer 15

SQL Server 2008 will allow to store dates from 1/1/0001 to 12/31/9999.

We can say that MS is creating history 🙂

-----------------------------------------------------------[font=Arial Black]Time Is Money[/font][font=Arial Narrow]Calculating the Number of Business Hours Passed since a Point of Time[/url][/font][font=Arial Narrow]Calculating the Number of Business Hours Passed Between Two Points of Time[/font]