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IsDate Function (Visual Basic) 

Returns a Boolean value indicating whether an expression represents a valid Date value.

Public Function IsDate(ByVal Expression As Object) As Boolean



Required. Object expression.

IsDate returns True if Expression is of the Date Data Type or can be converted to Date; otherwise, it returns False.

The Date data type holds both a date value and a time value. IsDate returns True if Expression represents a valid date, a valid time, or a valid date and time.

The following example uses the IsDate function to determine if several variables represent valid Date values.

Dim firstDate, secondDate As Date
Dim timeOnly, dateAndTime, noDate As String
Dim dateCheck As Boolean
firstDate = CDate("February 12, 1969")
secondDate = #2/12/1969#
timeOnly = "3:45 PM"
dateAndTime = "March 15, 1981 10:22 AM"
noDate = "Hello"
dateCheck = IsDate(firstDate)
dateCheck = IsDate(secondDate)
dateCheck = IsDate(timeOnly)
dateCheck = IsDate(dateAndTime)
dateCheck = IsDate(noDate)

In the preceding example, IsDate returns True for the first four calls and False for the last call.

Namespace: Microsoft.VisualBasic

Module: Information

Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)