共用方式為

IsDate Function

  • 發行項

This page is specific to the Visual Basic for Applications (VBA) Language Reference for Office 2010.

Returns True if the expression is a date or is recognizable as a valid date or time; otherwise, it returns False.

Syntax

IsDate(expression)

The required expression argument is a Variant containing a date expression or string expression recognizable as a date or time.

Remarks

In Microsoft Windows, the range of valid dates is January 1, 100 A.D. through December 31, 9999 A.D.; the ranges vary among operating systems.

Example

This example uses the IsDate function to determine if an expression is recognized as a date or time value.

Dim MyVar, MyCheck
MyVar = "04/28/2014"    ' Assign valid date value.
MyCheck = IsDate(MyVar)    ' Returns True.

MyVar = "April 28, 2014"    ' Assign valid date value.
MyCheck = IsDate(MyVar)    ' Returns True.

MyVar = "13/32/2014"    ' Assign invalid date value.
MyCheck = IsDate(MyVar)    ' Returns False.

MyVar = "04.28.14"    ' Assign valid time value
MyCheck = IsDate(MyVar)    ' Returns True.

MyVar = "04.28.2014"    ' Assign invalid time value.
MyCheck = IsDate(MyVar)    ' Returns False.