PowerShell script utilizing .NET WinForms to create a GUI with a live clock label.

clock.ps1

Add-Type -AssemblyName System.Windows.Forms

$Win32_ShowWindow = @'
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(int handle, int nCmdShow);
'@

$User32 = Add-Type -MemberDefinition $Win32_ShowWindow `
                   -Name 'User32' -Namespace 'Win32' -PassThru

# Minimize the PS console window
$SW_SHOWMINIMIZED = 2
$User32::ShowWindow(
    (Get-Process -ID $PID).MainWindowHandle,
     $SW_SHOWMINIMIZED
)

# Clock Form
$Frm_Clock = New-Object system.Windows.Forms.Form
$Frm_Clock.Size = "365, 100"
$Frm_Clock.text = "PSClock"
$Frm_Clock.BackColor= "#ffffff"
$Frm_Clock.MaximizeBox = 0
$Frm_Clock.MinimizeBox = 1
$Frm_Clock.ShowIcon = 0
$Frm_Clock.FormBorderStyle = "FixedSingle"
$Frm_Clock.StartPosition = "CenterScreen"
$Frm_Clock.TopMost = 1

# Clock Label
$Lbl_Clock = New-Object System.Windows.Forms.Label
$Lbl_Clock.AutoSize = 0
$Lbl_Clock.Dock = "Fill"
$Lbl_Clock.Font = New-Object System.Drawing.Font("Segoe UI", 24)
$Lbl_Clock.ForeColor = "Brown"
$Lbl_Clock.TextAlign = "MiddleCenter"
$Lbl_Clock.Text = "00/00/0000 00:00 XM"

Function UpdateClock()
{
    $Lbl_Clock.Text = Get-Date -Format "MM/dd/yyyy hh:mm tt"
}

# Timer to update clock
$Tmr_Update = New-Object System.Windows.Forms.Timer
$Tmr_Update.Interval = 100
$Tmr_Update.Add_Tick({ UpdateClock })

Function StartTimer()
{
    $Tmr_Update.Enabled = 1
    $Tmr_Update.Start()
}

Function StopTimer()
{
    $Tmr_Update.Stop()
    $Tmr_Update.Enabled = 0
}

StartTimer

$Frm_Clock.Controls.Add($Lbl_Clock)
$Frm_Clock.ShowDialog()