Conversion of a varchar data type to a datetime data type resulted in an out-of-range value in SQL query

Try ISDATE() function in SQL Server. If 1, select valid date. If 0 selects invalid dates.

SELECT cast(CONVERT(varchar, LoginTime, 101) as datetime)  
FROM AuditTrail 
WHERE ISDATE(LoginTime) = 1

EDIT :

As per your update i need to extract the date only and remove the time, then you could simply use the inner CONVERT

SELECT CONVERT(VARCHAR, LoginTime, 101) FROM AuditTrail 

or

SELECT LEFT(LoginTime,10) FROM AuditTrail

EDIT 2 :

The major reason for the error will be in your date in WHERE clause.ie,

SELECT cast(CONVERT(varchar, LoginTime, 101) as datetime)  
FROM AuditTrail
where CAST(CONVERT(VARCHAR, LoginTime, 101) AS DATE) <= 
CAST('06/18/2012' AS DATE)

will be different from

SELECT cast(CONVERT(varchar, LoginTime, 101) as datetime)  
FROM AuditTrail
where CAST(CONVERT(VARCHAR, LoginTime, 101) AS DATE) <= 
CAST('18/06/2012' AS DATE)

CONCLUSION

In EDIT 2 the first query tries to filter in mm/dd/yyyy format, while the second query tries to filter in dd/mm/yyyy format. Either of them will fail and throws error

The conversion of a varchar data type to a datetime data type resulted in an out-of-range value.

So please make sure to filter date either with mm/dd/yyyy or with dd/mm/yyyy format, whichever works in your db.

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