ISDATE() Function in SQL Server

ISDATE() function : This function in SQL Server is used to check if the specified expression is a valid date or not. Features :

• This function is used to find if the stated date is valid or not.
• This function comes under Date Functions.
• This function accepts only one parameter i.e, an expression.
• This function can also include time with the stated date.
• This function can either return 1 or 0.

Syntax :

ISDATE(expression)

Parameter : This method accepts only one parameter as given below as follows.

• expression -Specified expression which is to be checked.

Returns : It returns 1 if the stated expression is a valid date else it returns 0. Example-1 : Using ISDATE() function and getting the output.

SELECT ISDATE('2020/01/03');

Output :

1

Example-2 : Using ISDATE() function with a variable and getting the desired output.

DECLARE @exp VARCHAR(50);
SET @exp= '2021/12/25';
SELECT ISDATE(@exp);

Output :

1

Example-3 : Using ISDATE() function with date as parameter which includes time as well.

SELECT ISDATE('2021/01/03 08:55');

Output :

1

Example-4 : Using ISDATE() function with a invalid date and getting the output.

SELECT ISDATE('2021/01/32 08:55');

Output :

0

Application : This function is used to check if the given expression is a valid date or not.