Update only time from my Datetime field in sql

Question

I have a date 2013-12-14 05:00:00.000 in my table.

Now i want to update only time of that date. E.G to 2013-12-14 04:00:00.000

Is there any query to update o

Answer 1

use this script:

declare @curDate datetime=getdate() --or any other datetime 
declare @time time='22:31'
declare @hour int ,@min int
set @hour=datepart(hh,@time)
set @min=datepart(mm,@time)
select @curDate=Dateadd(HOUR,@hour,convert(datetime,convert(Date,@curDate)))
select @curDate=Dateadd(MINUTE,@min,@curDate)
Select @curDate

Answer 2

The previous query update only the hour portion but this query will update all portions of the time i.e hour, minutes, seconds:

UPDATE TABLE_NAME
SET DATETIME_FIELD = CONCAT(CAST(DATETIME_FIELD AS Date), ' ', CAST('2016-02-01 09:20:00.0000000' AS TIME))

Answer 3

User the below one to update the Time only for datetime column -

select  CONVERT(varchar(10),datecolumn, 120) + ' 12:34:56', 
        CONVERT(varchar(10),datecolumn, 120) + ' 00:00:00', 
        RSLV_LTR_INITIAL_DUE_DT, *
from twhere able1       

Answer 4

In case of just updating a particular part of the datetime you can use SMALLDATETIMEFROMPARTS like:

UPDATE MyTable 
SET MyDate = SMALLDATETIMEFROMPARTS(YEAR(MyDate), MONTH(MyDate), DAY(MyDate), <HoursValue>, <MinutesValue>) 

In other cases it may be required to copy parts of datetime to other or update only certain parts of the datetime:

UPDATE MyTable 
SET MyDate = SMALLDATETIMEFROMPARTS(YEAR(MyDate), MONTH(MyDate), DAY(MyDate), DATEPART(hour, MyDate), DATEPART(minute, MyDate)) 

Refer SQL Server Date/Time related API references for more such functions

Answer 5

DECLARE @Time as TIME;
DECLARE @Date as DATETIME;

SELECT @Time = CONVERT(TIME, '2016-01-01 09:30:00.000');
SELECT @Date = CONVERT(date, GETDATE()); --2017-03-10 16:37:34.403

SELECT DATEADD(MINUTE, DATEPART(MINUTE, @Time), DATEADD(HH, DATEPART(HOUR, @Time), @Date))

OUTPUT: 2017-03-10 09:30:00.000

Answer 6

UPDATE TABLE_NAME SET DATETIME_FIELD = CAST(CAST(CONVERT(DATE, DATETIME_FIELD,101) AS VARCHAR) + ' 2' + ':' +  '22' AS DATETIME) WHERE (OUR_CONDTTION)