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Converting VBScript's IsDate Function


Windows PowerShell


Definition: Returns a Boolean value indicating whether an expression can be converted to a date.

IsDate

Windows PowerShell makes it easy to format and manipulate date and time values … provided, of course, that you actually have date and time values. To verify that a value truly is a date-time value all you have to do is use the -is operator and check to see if the data type is datetime. For example, these two lines of code assign a value to the variable $a and then determine whether or not $a is a date-time value:



$a = 11/2/2006 
$a -is [datetime]

When you run this command you should get the following:



False

Why is this False; why isn’t 11/2/2006 a valid date? That’s easy: to assign a date to a variable you need to enclose that date in double quote marks and specify the [datetime] variable type:



$a = [datetime] "11/2/2006"

Without the double quote marks Windows PowerShell believes that this is a mathematical expression: 11 divided by 2 divided by 2006. In fact, if you check the value of $a you’ll get back this:

0.00274177467597208

With the quotes but without the [datetime] specified, Windows PowerShell thinks this is a string and still returns False.


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