SQL Server ISDATE() Function

Check if the expression is a valid date:

SELECT ISDATE('2017-08-25');

Definition and Usage

The ISDATE() function checks an expression and returns 1 if it is a valid date, otherwise 0.

ISDATE(expression)

Parameter	Description
expression	Required. The expression to test

Works in:	SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Check if the expression is a valid date:

SELECT ISDATE('2017');

Check if the expression is a valid date:

SELECT ISDATE('Hello world!');