Switch themes at specified time for windows

switch_to_dark_at_specified_time

$time = Get-Date
$hourToSwitch = 18
$tillHour = 6
$shouldSwitchSystemTheme = 1


# function to get list of hours between hourtoswitch and tillhour
function GetDarkHours()
{
    $hours = New-Object System.Collections.Generic.List[int]
    $i = $hourToSwitch
    while (1)
    {
        $hours.Add($i)
        $i++
        # if i is 24 then set it ot 0
        if ($i -eq 24) {$i = 0}
        # if i is equal to tillhour then break the loop. + 1 to include tillhour
        if ($i -eq $tillHour + 1) { break }
    }
    return $hours
}

$darkHours = GetDarkHours
Write-Output $darkHours
# if time is in the dark hours then switch the system theme to dark
if ($darkHours -contains $time.Hour) {
    Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize -Name AppsUseLightTheme -Value 0
    if ($shouldSwitchSystemTheme -eq 1) {
        Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize -Name SystemUsesLightTheme -Value 0
    }
}
elseif ($darkHours -notcontains $time.Hour) {
    Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize -Name AppsUseLightTheme -Value 1
    if ($shouldSwitchSystemTheme -eq 1) {
        Set-ItemProperty -Path HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize -Name SystemUsesLightTheme -Value 1
    }
}

PS script to switch themes at specified time.
Run with task scheduler to automate switching themes.