excel functions

MS Excel: ISDATE Function (VBA)

This Excel tutorial explains how to use the Excel ISDATE function with syntax and examples.


The Microsoft Excel ISDATE function returns TRUE if the expression is a valid date. Otherwise, it returns FALSE.


The syntax for the ISDATE function in Microsoft Excel is:

IsDate( expression )

Parameters or Arguments

It is a variant that will be evaluated as a date.

Applies To

The ISDATE function can be used in the following versions of Microsoft Excel:

  • Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

Type of Excel Function

The ISDATE function can be used in Microsoft Excel as the following type of function:

  • VBA function (VBA)

Example (as VBA Function)

The ISDATE function can only be used in VBA code in Microsoft Excel.

Let's look at some Excel ISDATE function examples and explore how to use the ISDATE function in Excel VBA code:

Result: TRUE

IsDate("Tech on the Net")
Result: FALSE

IsDate("January 3, 2004")
Result: TRUE

For example:

Dim LValue As Boolean

LValue = IsDate("Tech on the Net")

In this example, the variable called LValue would contain FALSE as a value.