This simple PHP script lets you know the time of your VAC ban with ± 30 second precision. Valve shows only the "days since last ban" on your profile, but not the precise time. This script watches when the number of days changes and sends you a Telegram message. With this, you know precisely when the number of days change on the steam page = when…

VacWatch.php

<?php
$saveFile = __DIR__ . "/vacwatch.txt";
$steamApiKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
$steamProfileIds = [765611984466XXXXX, 765611981505XXXXX];
$telegramBotToken = "376243970:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
$telegramChatId = "-1001135186648";

$apiUrl = "https://api.steampowered.com/ISteamUser/GetPlayerBans/v1/?key=$steamApiKey&steamids=" . implode(",", $steamProfileIds);

// Create file if it doesnt exists
if (!file_exists($saveFile)) {
    touch($saveFile) or die("cannot create $saveFile");
}

while (true) {
    $responseArray = json_decode(file_get_contents($apiUrl), true)["players"];
    $saveFileArray = json_decode(file_get_contents($saveFile), true);

    foreach ($steamProfileIds as $profileId) {
        if (getProfile($responseArray, $profileId) != getProfile($saveFileArray, $profileId)) {
            // Nicely formatted array to JSON string
            $responseText = json_encode($responseArray, JSON_PRETTY_PRINT);

            // Send telegram message
            $data = [
                "text" => "```\n$responseText\n```",
                "chat_id" => $telegramChatId,
                "parse_mode" => "Markdown"
            ];

            file_get_contents("https://api.telegram.org/bot$telegramBotToken/sendMessage?" . http_build_query($data));

            // Save the new data
            file_put_contents($saveFile, $responseText);

            // Stop checking for changes in this iteration
            break;
        }
    }

    // Wait 30 seconds before next check
    sleep(30);
}

function getProfile($playersArray, $profileId) {
    foreach ($playersArray as $player) {
        if ($player["SteamId"] == $profileId)
            return $player;
    }
    return null;
}