PowerShell function to show you when the next patch Tuesday will occur. You can also specify month/year to find historical or future dates.

Get-PatchTue.ps1

function Get-PatchTue {
	<#
	.SYNOPSIS
	Get the Patch Tuesday of a month
	.PARAMETER month
	The month to check
	.PARAMETER year
	The year to check
	.EXAMPLE
	Get-PatchTue -month 6 -year 2015
	.EXAMPLE
	Get-PatchTue June 2015
	#>
	param(
		[string]$month = (get-date).month,
		[string]$year = (get-date).year)
	$firstdayofmonth = [datetime] ([string]$month + "/1/" + [string]$year)
	(0..30 | ForEach-Object {
			$firstdayofmonth.adddays($_)
		} |
		Where-Object {
			$_.dayofweek -like "Tue*"
		})[1]
}