PowerShell Time Zone Picker

timezone-picker.ps1

clear
$tz_found = $false
do { 
    $q = "`nEnter the first 3 letters of time zone you want to set (e.g. Eastern = eas)"
    do {
        $tz_query = Read-Host -Prompt $q
    } until ($tz_query.Length -gt 2)
    
    $timezone_list = Get-TimeZone -Name "*$($tz_query)*" -ErrorAction SilentlyContinue
    if ($timezone_list.Length -gt 0) {
        Write-Host "`nThe following time zones were found:`n"
        foreach ($tz in $timezone_list) { Write-Host "$([array]::indexof($timezone_list,$tz))) $($tz.DisplayName)" }
        do {
            $tz_in_list = Read-Host -Prompt "`nDid you find your time zone in the list? [yes/no]"
            if ($tz_in_list.ToLower() -eq "yes") { 
                $tz_found = $true 
                Write-Host "OK" -ForegroundColor Green
            }
            elseif ($tz_in_list.ToLower() -in @("no","n")) {
                Write-Host "Bummer. Let's try again.`n" -ForegroundColor Yellow
            }
        } until ($tz_in_list.ToLower() -in @("yes","no","n"))
    }
    else { Write-Host "No time zones found. Please try again." -ForegroundColor Red }
    
} until ($tz_found -eq $true)

$q1 = "`nEnter the item number from the first column of the time zone list. [0-$($timezone_list.Length-1)]"
do {
    $tz_query_index = Read-Host -Prompt $q1
    if ($tz_query_index -match "^\d+$" -and $timezone_list[$tz_query_index]) {
        Write-Host "OK" -ForegroundColor Green
        $tz_query_index = [int]$tz_query_index
        Write-Host 
        $q2 = "You selected '$($timezone_list[$tz_query_index])'. Proceed to set the time zone? [yes/no]"
        do {
            $tz_sel_correct = Read-Host -Prompt $q2
        } until ($tz_sel_correct.ToLower() -in @("yes","no","n"))
        if ($tz_sel_correct -eq "yes") {
            Write-Host "OK" -ForegroundColor Green
            Set-TimeZone –Name $timezone_list[$tz_query_index].StandardName
            Write-Host "`nThe time zone has been set." -ForegroundColor Green

        }
        else {
            $tz_query_index = $null # Force another loop
        }
    }
    elseif ($tz_query_index -match "^\d+$" -and !$timezone_list[$tz_query_index]) {
        Write-Host "The item number you entered was not found in the time zone list. Please try again." -ForegroundColor Red
    }
    else {
        Write-Host "Please enter a numerical value." -ForegroundColor Red
    }
} until ($tz_query_index -match "^\d+$" -and $timezone_list[$tz_query_index]) # Verify the index is a number and the index exists in the array