How to check a valid date in SQL Server?

Question

Aryan Kumar · Answer

Sure, I can help you with that.
To check a valid date in SQL Server, you can use the ISDATE() function. The
ISDATE() 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
SELECT ISDATE('2023-01-01');
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
ISDATE ( expression )
expression is 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
SELECT ISDATE('2023-01-01 12:00:00');
This query will also return the value 1, which means that the value '2023-01-01 12:00:00' is a valid datetime.

Rocky Dada · Answer

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:
arduinoCopy code
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.

Ashutosh Kumar Verma · Answer

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');
Outputand and and 1

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How to check a valid date in SQL Server?

Ashutosh Kumar Verma

3 Answers

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