A way to extract from a DateTime value data without seconds

Question

I have an sql DateTime (ms sql server) and want to extract the same date without the seconds: e.g. 2011-11-22 12:14:58.000 to become: 2011-11

Answer 1

For a solution that truncates using strings try this:

SELECT CAST(CONVERT(CHAR(16), GetDate(),20) AS datetime)

---

CHAR(16) works only if our variable is converted to ODBC canonical format, as shown above by using 20 as the format specifier.

DECLARE @date DateTime = '2011 Nov 22 12:14:55';
SELECT CONVERT(Char(16), @date ,20) AS datetime

Results:

| datetime         |
|------------------|
| 2011-11-22 12:14 |

Then you simply cast back to a DateTime type to continue using the value.

NOTE: This is only viable for data types that do not carry TimeZone info. Also type conversions to VarChar and back are usually LESS performant than using DateTime functions that use numeric operations internally.

Consider other solutions posted if performance is a concern or if you must retain timezone information.

Answer 2

DECLARE @TheDate DATETIME
SET @TheDate = '2011-11-22 12:14:58.000'

DATEADD(mi, DATEDIFF(mi, 0, @TheDate), 0)

In queries

/* ...all records in that minute; index-friendly expression */ 
WHERE TheDate BETWEEN DATEADD(mi, DATEDIFF(mi, 0, @TheDate), 0) 
                  AND DATEADD(mi, DATEDIFF(mi, 0, @TheDate) + 1, 0)

Answer 3

To Round Off it:

DECLARE @TheDate DATETIME;
SET @TheDate = '2019-1-2 12:14:58.400';

SELECT CAST(@TheDate AS SMALLDATETIME);

To just Truncate:

DECLARE @TruncTheDate DATETIME;
SET @TruncTheDate = '2019-1-2 12:14:58.400';

SELECT DATEADD(mi, DATEDIFF(mi, 0, @TruncTheDate), 0);

Answer 4

If there is no milliseconds, than

DECLARE @dt datetime2 = '2011-11-22 12:14:58.000';
DECLARE @goalDt datetime2 = DATEADD(second,-DATEPART(second,@dt), @dt);

To remove a milliseconds part, add

SET @goalDt = DATEADD(millisecond,-DATEPART(millisecond,@goalDt ), goalDt dt);

Answer 5

From SQL Server 2014, You can use Format function for this.

for Ex.

 declare @Startdate datetime = '2020-11-07 15:27:50.713'

 set  @Startdate = Convert(datetime,FORMAT(@Startdate, 'yyyy-MM-dd HH:mm'))


> Result is 
2020-11-07 15:27:00.000

Answer 6

With a little fiddling around, this seems to work well:

SELECT CAST(CONVERT(CHAR(17), bl.[time],113) AS varchar(17))

Result given: 2011-11-22 12:14

The exact way I'm using it in my query as part of the selection list :

,CAST(CONVERT(CHAR(17), bl.[time],113) AS varchar(17))
+ '    (UTC +0)' AS [TIME]

Gives me the result: 15 Dec 2017 06:43 (UTC +0)