# Define the reboot time
$rebootTime = "21:00"

# Get the current date and time
$currentDate = Get-Date

# Parse the reboot time into a DateTime object for today
$rebootDateTime = [datetime]::ParseExact("$($currentDate.ToString('yyyy-MM-dd')) $rebootTime", "yyyy-MM-dd HH:mm", $null)

# Check if the reboot time is in the past for today; if so, schedule it for tomorrow
if ($rebootDateTime -lt $currentDate) {
    $rebootDateTime = $rebootDateTime.AddDays(1)
}

# Format the DateTime object for the task scheduler
$taskTime = $rebootDateTime.ToString("HH:mm")

# Create a scheduled task action for a forced reboot
$taskName = "ForcedReboot"
$action = New-ScheduledTaskAction -Execute "shutdown.exe" -Argument "/r /f /t 0"

# Create a trigger for the specified time
$trigger = New-ScheduledTaskTrigger -Once -At $rebootDateTime

# Configure settings to allow the task to run when no user is logged in
$settings = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -StartWhenAvailable `
    -RunOnlyIfIdle:$false -WakeToRun

# Set the task to run with the highest privileges and even when no user is logged in
$principal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest

# Register the task
Register-ScheduledTask -TaskName $taskName -Action $action -Trigger $trigger -Settings $settings -Principal $principal -Force

Write-Host "Scheduled reboot at $rebootDateTime, even if no user is logged in."