[PowerShell每日技巧]判断日期是否合法(20140204)

DAIC

If you need to test whether some information resembles a valid date format, here is a test function:

1. function Test-Date
   
2. {
   
3.     param
   
4.     (
   
5.         [Parameter(Mandatory=$true]
   
6.         $Date
   
7.     )
   
8. 
   
9.     (($Date -as [DateTime]) -ne $null)
   
10. }

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It uses the -as operator to try and convert the input to a DateTime format. If this fails, the result is $null, so the function checks for this and returns $true or $false. Note that the -as operator uses your local DateTime format.

http://powershell.com/cs/blogs/tips/archive/2014/02/04/testing-for-valid-date.aspx