get-datepicker.ps1

function Get-DatePicker
{
    [CmdletBinding()]
    [OutputType([System.DateTime])]
    Param([string]$windowTitle=$null)

    Add-type -AssemblyName "System.windows.forms"
    $winForm = New-object Windows.Forms.Form
    if([string]::IsNullOrEmpty($windowTitle)){
        $winForm.Text = "DatePicker Control"
    }else{
        $winForm.Text = $windowTitle
    }
    $winForm.Size = New-Object Drawing.Size(200,55)
    $winForm.StartPosition = [System.Windows.Forms.FormStartPosition]::CenterScreen
    $winform.Add_Shown({ $winForm.TopMost = $true; $winForm.Activate(); })
    $datePicker = New-Object System.Windows.Forms.DateTimePicker
    $datePicker.Add_KeyPress({ 
        if($_.KeyChar -eq [System.Char][System.Windows.Forms.Keys]::Enter){ 
            $winForm.Close()
        }
    })
    $winForm.Controls.Add($datePicker)
    $winform.ShowDialog() | Out-null
    $datePicker.Value.Date
}