Joe's Time Understood

CODE FOLLOWS

<div id="page">
    <?php
    include('includes/header.php');
    ?>

    <div class="page-heading">
        <h1>Joe's Time Understood</h1>
    </div>

    <?php
    error_reporting(E_ALL); // Enable full error reporting

    // Retrieve form data safely
    $step = $_POST['step'] ?? 0;
    $years = filter_input(INPUT_POST, 'years', FILTER_SANITIZE_NUMBER_INT);
    date_default_timezone_set('America/New_York');

    // Get current date and time
    $current_year = (int)date("Y");
    $current_day_of_year = (int)date("z") + 1; // 'z' gives zero-based day, so add 1
    $current_hour = (int)date("G"); // 24-hour format (0-23)
    $current_minute = (int)date("i"); // Minutes (0-59)
    $current_second = (int)date("s"); // Seconds (0-59)
    $current_millisecond = (int)(microtime(true) * 1000) % 1000; // Milliseconds

    if ($step == 0) { // First-time form display
        ?>
        <form action="time.php" method="POST">
            <label for="years">Enter Number of Years:</label>
            <input type="number" id="years" name="years" min="1" step="1" placeholder="e.g., 5" required>
            <br><br>
            <input type="hidden" name="step" value="1">
            <input type="submit" name="submit" value="Submit">
        </form>
        <?php
    } else { // Process and display results
        if (!is_numeric($years) || $years < 1) {
            echo "<p style='color: red;'>Please enter a valid number of years.</p>";
        } else {
            // Time calculations
            $days_per_year = 365;
            $hours_per_day = 24;
            $minutes_per_hour = 60;
            $seconds_per_minute = 60;
            $milliseconds_per_second = 1000;
            $millennium = 1000; // 1 millennium = 1000 years

            // Convert input years to time units
            $total_millennia = $years / $millennium;
            $total_days = $years * $days_per_year;
            $total_hours = $total_days * $hours_per_day;
            $total_minutes = $total_hours * $minutes_per_hour;
            $total_seconds = $total_minutes * $seconds_per_minute;
            $total_milliseconds = $total_seconds * $milliseconds_per_second;

            echo "<h3>In <strong>" . number_format($years) . "</strong> years, there are:</h3>";
            echo "<ul>
                    <li><strong>" . number_format($total_millennia, 3) . "</strong> millennia</li>
                    <li><strong>" . number_format($total_days) . "</strong> days</li>
                    <li><strong>" . number_format($total_hours) . "</strong> hours</li>
                    <li><strong>" . number_format($total_minutes) . "</strong> minutes</li>
                    <li><strong>" . number_format($total_seconds) . "</strong> seconds</li>
                    <li><strong>" . number_format($total_milliseconds) . "</strong> milliseconds</li>
                  </ul>";

            // ==== Time Since Year 0 AD ====
            $total_days_since_0_AD = ($current_year * $days_per_year) + $current_day_of_year;
            $total_hours_since_0_AD = $total_days_since_0_AD * $hours_per_day + $current_hour;
            $total_minutes_since_0_AD = $total_hours_since_0_AD * $minutes_per_hour + $current_minute;
            $total_seconds_since_0_AD = $total_minutes_since_0_AD * $seconds_per_minute + $current_second;
            $total_milliseconds_since_0_AD = $total_seconds_since_0_AD * $milliseconds_per_second + $current_millisecond;

            echo "<h3>From Year 0 A.D. to Now (<strong>$current_year</strong> at <strong>$current_hour:$current_minute:$current_second.$current_millisecond EST</strong>):</h3>";
            echo "<ul>
                    <li><strong>" . number_format($current_year / $millennium, 3) . "</strong> millennia</li>
                    <li><strong>" . number_format($total_days_since_0_AD) . "</strong> days</li>
                    <li><strong>" . number_format($total_hours_since_0_AD) . "</strong> hours</li>
                    <li><strong>" . number_format($total_minutes_since_0_AD) . "</strong> minutes</li>
                    <li><strong>" . number_format($total_seconds_since_0_AD) . "</strong> seconds</li>
                    <li><strong>" . number_format($total_milliseconds_since_0_AD) . "</strong> milliseconds</li>
                  </ul>";
        }
        ?>
        <form action="time.php" method="POST">
            <input type="hidden" name="step" value="0">
            <input type="submit" name="submit" value="Try Again">
        </form>
        <?php
    }
    ?>

</div>

<?php include('includes/footer.php'); ?>