How to: Validate Strings That Represent Dates or Times (Visual Basic)
The following code example sets a Boolean value that indicates whether a string represents a valid date or time.
Example
Dim isValidDate As Boolean = IsDate("01/01/03")
Dim isValidTime As Boolean = IsDate("9:30 PM")
Compiling the Code
Replace ("01/01/03") and "9:30 PM" with the date and time you want to validate. You can replace the string with another hard-coded string, with a String variable, or with a method that returns a string, such as InputBox.
Robust Programming
Use this method to validate the string before trying to convert the String to a DateTime variable. By checking the date or time first, you can avoid generating an exception at run time.