How to check a valid date in SQL Server?
Ask by Ashutosh Kumar Verma
Updated 20 Jun 2023
Sure, I can help you with that.
To check a valid date in SQL Server, you can use the
ISDATE()function. TheISDATE()function takes a date expression as input and returns 1 if the expression is a valid date, and 0 if the expression is not a valid date.For example, the following query will check if the value '2023-01-01' is a valid date:
SQL
This query will return the value 1, which means that the value '2023-01-01' is a valid date.
Here is the syntax for the
ISDATE()function:SQL
expressionis the date expression that you want to check.The
ISDATE()function can also be used to check for a valid time or datetime. For example, the following query will check if the value '2023-01-01 12:00:00' is a valid datetime:SQL
This query will also return the value 1, which means that the value '2023-01-01 12:00:00' is a valid datetime.
In SQL Server, you can use the ISDATE function to check if a given string is a valid date. The ISDATE function returns 1 if the input string can be converted to a date, and 0 otherwise.
Here's an example query that uses the ISDATE function to check if a string is a valid date:
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SELECT ISDATE('2022-04-11') AS IsDateValid;In this example, the ISDATE function is used to check if the string '2022-04-11' is a valid date. The result of the query will be a single column called IsDateValid, which will contain the value 1 if the string is a valid date, and 0 if it is not.
You can also use the TRY_CONVERT function to convert a string to a date, and check if the conversion was successful using the IS NOT NULL operator. Here's an example query that demonstrates this approach:
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SELECT TRY_CONVERT(date, '2022-04-11') AS DateValue WHERE TRY_CONVERT(date, '2022-04-11') IS NOT NULL;In this example, the TRY_CONVERT function is used to convert the string '2022-04-11' to a date. The WHERE clause checks if the conversion was successful, by verifying that the result of the TRY_CONVERT function is not null. The result of the query will be a single column called DateValue, which will contain the date value if the conversion was successful. If the conversion was not successful, the query will not return any rows.
ISDATE():
SQL ISDATE() is used to check the valid date. If given date is valid then it returns 1 otherwise returns 0.
Example:
SELECT ISDATE('2021/11/25');