Tricky powershell this time

Right,

So I have a function to bring up a date and time

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing") 

Function Prompt-For-Date
{
Param(  
    [string]$sDatePrompt = "Select a Date"
) #End Param

$script:dtmDate = ''
$objForm = New-Object Windows.Forms.Form 

$objForm.Text = $sDatePrompt
$objForm.Size = New-Object Drawing.Size @(300,300) 
$objForm.StartPosition = "CenterScreen"

$objForm.KeyPreview = $True

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Enter") 
        {
            $script:dtmDate = $objCalendar.SelectionStart
            $objForm.Close()
            
        }
    })

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Escape") 
        {
            $objForm.Close()
        }
    })

$objCalendar = New-Object System.Windows.Forms.MonthCalendar 
$objCalendar.ShowTodayCircle = $False
$objCalendar.MaxSelectionCount = 1
$objForm.Controls.Add($objCalendar) 

$objForm.Topmost = $True

$objForm.Add_Shown({$objForm.Activate()})  
[void] $objForm.ShowDialog()
return $script:dtmDate


}

$dateReturned = Prompt-For-Date -sDatePrompt "Please Select A Date"
Write-Host "Date:" $dateReturned

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I have a bit of code which will pull information

function Copy-SelectedFile
{
    [CmdletBinding()]
    param(
        [parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)]
        [ValidateScript({Test-Path -path $_})]
        [string]$SourcePath,

        [parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)]
        [string]$DestinationPath,

        [parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)]
        [System.Management.Automation.PSCredential]$Credential = (Get-Credential), 

        [parameter(ValueFromPipelineByPropertyName = $true)]
        [datetime]$MinimumAgeTime = ([datetime]::now), 

        [parameter(ValueFromPipelineByPropertyName = $true)]
        [datetime]$MaximumAgeTime
    )

    $Files = Get-ChildItem -Path $SourcePath | Where-Object { $_.LastWriteTime -gt $MinimumAgeTime -and $_.LastWriteTime -lt $MaximumAgeTime}
    
    $Destination = New-Item -Path $DestinationPath -ItemType Directory -Name $MinimumAgeTime.ToString('ddMMyy')
    Copy-Item -Path $Files -Destination $Destination -Credential $Credential -Recurse
}

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How the hell do I get my date and time to get pushed into the second bit of code to pull the data off the disk?1?!?!?!?!?!?!?

Any help would be great.

Thanks
Alex