How to convert datetime to date only (with time set to 00:00:00.000)
declare @originalDate datetime select @originalDate = '2009-06-24 09:52:43.000' declare @withoutTime datetime select @withoutTime = dateadd(d, datediff(d, 0, @originalDate), 0) select @withoutTime
SELECT CAST(CONVERT(VARCHAR,GETDATE(),102) AS DATETIME) SELECT CAST(CONVERT(VARCHAR(10),'2009-06-24 09:52:43.000',102) AS DATETIME)
James is correct. If you're starting off with a string, and the format will always be what you say it is, then you keep it simple and efficient. Use
LEFT( @StrDate, 10) and
CONVERT that to your datetime value. Done.
If your input string could be any valid date/time format, then you have to use
CONVERT(datetime, @StrDate) first. After that you go with what Bing just said to strip off the time part.
An enhancement to the unsupported version:
I am not sure if this may effect any performance.
getdate() is an input timestamp in my query.
select cast(cast(getdate() as DATE) as DATETIME)
If you will always have the date in the same format, i.e. yyyy-MM-DD you can grab the first 10 characters if the value and insert that which is the equivelant of 00:00:00.0000 time for that date.
select left('2009-12-32 4:32:00',10)
This is a very efficient way to do this as it does't require converting data types HOWEVER, it does require that the date will always be formatted with a four digit year and two digit day & month.
cast it to a date, and then you can use CONVERT to get just the date.
INSERT MyTable(Column1) SELECT CONVERT(CHAR(8), CAST('2009-06-24 09:52:43.000' AS DATETIME), 112)
Probably a cleaner and more portable way to do this, but my years old idiom is:
insert into tbl (date_column) select convert(varchar, convert (datetime, '2009-06-24 09:52:43.000'), 101)
A variety of hacks:
- Convert your string to a datetime, then back again using the optional "style" parameter to
convertto convert your datetime to a string using just the date portion
substringto chop off the end
- round the datetime using
I have found that casting as a date, then to a datetime to be very efficient and intuitive.
SELECT CAST(CAST(GETDATE() as date) as datetime)
Strip the time, and cast it to date:
select cast(left(yourstring, 10) as datetime)