How to convert a "dd/mm/yyyy" string to datetime in SQL Server?

I tried this

SELECT convert(datetime, '23/07/2009', 111)

but got this error

The conversion of a varchar data type to 开发者_运维百科a datetime data type resulted in an out-of-range value.

However

SELECT convert(datetime, '07/23/2009', 111)

Is OK though

How to fix the 1st one?

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The last argument of CONVERT seems to determine the format used for parsing. Consult MSDN docs for CONVERT.

111 - the one you are using is Japan yy/mm/dd.

I guess the one you are looking for is 103, that is dd/mm/yyyy.

So you should try:

 SELECT convert(datetime, '23/07/2009', 103)

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Try:

SELECT convert(datetime, '23/07/2009', 103)

this is British/French standard.

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SELECT convert(varchar(10), '23/07/2009', 111)

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SELECT COALESCE(TRY_CONVERT(datetime, Value, 111), 
    TRY_CONVERT(datetime, Value, 103), DATEADD(year,-1,GetDate()))

You could add additional date formats as the Coalesce will go through each until it returns a successful Try_Convert

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SQL Server by default uses the mdy date format and so the below works:

SELECT convert(datetime, '07/23/2009', 111)

and this does not work:

SELECT convert(datetime, '23/07/2009', 111)

I myself have been struggling to come up with a single query that can handle both date formats: mdy and dmy.

However, you should be ok with the third date format - ymd.

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SELECT convert(datetime, '23/07/2009', 103)

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You can convert a string to a date easily by:

CAST(YourDate AS DATE)