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Created October 30, 2024 17:45
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timezones.md

Timezone Conversion Tool

human (Jul 4, 2024, 01:12 PM)

Build me a tool for understanding timezones. Use only modern browser APIs - no React, no extra libraries.

I want to be able to enter a time (using date / time HTML inputs) and have a # ID in the URL update to reflect that date and time - the page should then show the date and time in the viewing user's timezone but also convert it to a list of common US and worldwide timezones

assistant (Jul 4, 2024, 01:12 PM)

Certainly! I'll create a simple HTML page with JavaScript that uses modern browser APIs to build a timezone conversion tool as you've described. This tool will allow users to input a date and time, update the URL with a hash, and display the converted time in various timezones.

create Timezone Converter Tool

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Timezone Converter</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
    </style>
</head>
<body>
    <h1>Timezone Converter</h1>
    <form id="timeForm">
        <label for="dateTime">Select Date and Time (UTC):</label>
        <input type="datetime-local" id="dateTime" required>
        <button type="submit">Convert</button>
    </form>
    <div id="result"></div>

    <script>
        const form = document.getElementById('timeForm');
        const resultDiv = document.getElementById('result');
        const dateTimeInput = document.getElementById('dateTime');

        const timezones = [
            { name: 'Local Time', zone: Intl.DateTimeFormat().resolvedOptions().timeZone },
            { name: 'New York', zone: 'America/New_York' },
            { name: 'Los Angeles', zone: 'America/Los_Angeles' },
            { name: 'Chicago', zone: 'America/Chicago' },
            { name: 'London', zone: 'Europe/London' },
            { name: 'Paris', zone: 'Europe/Paris' },
            { name: 'Tokyo', zone: 'Asia/Tokyo' },
            { name: 'Sydney', zone: 'Australia/Sydney' },
            { name: 'Dubai', zone: 'Asia/Dubai' },
            { name: 'Moscow', zone: 'Europe/Moscow' }
        ];

        function updateUrlHash(dateTime) {
            const timestamp = new Date(dateTime).getTime();
            window.location.hash = `#${timestamp}`;
        }

        function getDateTimeFromHash() {
            const hash = window.location.hash.slice(1);
            return hash ? new Date(parseInt(hash)) : null;
        }

        function formatDate(date, timezone) {
            return date.toLocaleString('en-US', { timeZone: timezone, dateStyle: 'full', timeStyle: 'long' });
        }

        function displayResults(dateTime) {
            let html = '<table><tr><th>Timezone</th><th>Date & Time</th></tr>';
            timezones.forEach(tz => {
                html += `<tr><td>${tz.name}</td><td>${formatDate(dateTime, tz.zone)}</td></tr>`;
            });
            html += '</table>';
            resultDiv.innerHTML = html;
        }

        form.addEventListener('submit', (e) => {
            e.preventDefault();
            const dateTime = new Date(dateTimeInput.value + 'Z'); // Append 'Z' to treat input as UTC
            updateUrlHash(dateTime);
            displayResults(dateTime);
        });

        window.addEventListener('load', () => {
            const hashDateTime = getDateTimeFromHash();
            if (hashDateTime) {
                dateTimeInput.value = hashDateTime.toISOString().slice(0, 16);
                displayResults(hashDateTime);
            }
        });

        window.addEventListener('hashchange', () => {
            const hashDateTime = getDateTimeFromHash();
            if (hashDateTime) {
                dateTimeInput.value = hashDateTime.toISOString().slice(0, 16);
                displayResults(hashDateTime);
            }
        });
    </script>
</body>
</html>

I've created an HTML file that implements the timezone converter tool you requested. Here's a breakdown of its functionality:

  1. The page includes a form with a datetime-local input for selecting the date and time in UTC.
  2. When the form is submitted, it updates the URL hash with the timestamp and displays the converted times.
  3. The tool converts the input time to 10 different timezones, including the user's local timezone.
  4. If the page is loaded with a timestamp in the URL hash, it automatically populates the form and displays the conversions.
  5. The page uses only modern browser APIs without any external libraries or frameworks.

Key features:

  • Uses the Intl.DateTimeFormat API for timezone conversions and formatting.
  • Updates the URL hash when a new time is entered, allowing for easy sharing.
  • Responds to changes in the URL hash, updating the display accordingly.
  • Displays times in a clear, tabular format.
  • Includes basic CSS for improved readability.

To use this tool:

  1. Save the HTML content to a file (e.g., timezone-converter.html).
  2. Open the file in a modern web browser.
  3. Enter a date and time in the input field and click "Convert".
  4. The page will update with the converted times and the URL will change to include the timestamp.

You can share the URL with the timestamp, and when others open it, they'll see the same time converted to their local timezone and the other listed timezones.

Would you like me to explain any part of the code in more detail or make any modifications to the tool?

human (Jul 4, 2024, 01:13 PM)

Make it so the user can select a time zone when they pick the time - that time zone should be preserved in the URL too. Default to the users timezone as detected from their browser, provide UTC and the other common timezones as options in a select box

assistant (Jul 4, 2024, 01:13 PM)

Certainly! I'll modify the timezone converter tool to include a timezone selection option when picking the time. We'll preserve this timezone in the URL along with the timestamp, and set the default to the user's detected timezone.

create Timezone Converter Tool with Selectable Input Timezone

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Timezone Converter</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
        form {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }
        label {
            margin-right: 5px;
        }
    </style>
</head>
<body>
    <h1>Timezone Converter</h1>
    <form id="timeForm">
        <label for="dateTime">Select Date and Time:</label>
        <input type="datetime-local" id="dateTime" required>
        <label for="timezone">in timezone:</label>
        <select id="timezone"></select>
        <button type="submit">Convert</button>
    </form>
    <div id="result"></div>

    <script>
        const form = document.getElementById('timeForm');
        const resultDiv = document.getElementById('result');
        const dateTimeInput = document.getElementById('dateTime');
        const timezoneSelect = document.getElementById('timezone');

        const timezones = [
            { name: 'UTC', zone: 'UTC' },
            { name: 'New York', zone: 'America/New_York' },
            { name: 'Los Angeles', zone: 'America/Los_Angeles' },
            { name: 'Chicago', zone: 'America/Chicago' },
            { name: 'London', zone: 'Europe/London' },
            { name: 'Paris', zone: 'Europe/Paris' },
            { name: 'Tokyo', zone: 'Asia/Tokyo' },
            { name: 'Sydney', zone: 'Australia/Sydney' },
            { name: 'Dubai', zone: 'Asia/Dubai' },
            { name: 'Moscow', zone: 'Europe/Moscow' }
        ];

        const userTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;

        // Populate timezone select
        timezones.forEach(tz => {
            const option = document.createElement('option');
            option.value = tz.zone;
            option.textContent = `${tz.name} (${tz.zone})`;
            timezoneSelect.appendChild(option);
        });

        // Set default timezone to user's timezone
        timezoneSelect.value = userTimezone;

        function updateUrlHash(dateTime, timezone) {
            const timestamp = dateTime.getTime();
            window.location.hash = `#${timestamp},${timezone}`;
        }

        function getDateTimeFromHash() {
            const hash = window.location.hash.slice(1);
            if (hash) {
                const [timestamp, timezone] = hash.split(',');
                return {
                    dateTime: new Date(parseInt(timestamp)),
                    timezone: timezone || userTimezone
                };
            }
            return null;
        }

        function formatDate(date, timezone) {
            return date.toLocaleString('en-US', { timeZone: timezone, dateStyle: 'full', timeStyle: 'long' });
        }

        function displayResults(dateTime, inputTimezone) {
            let html = '<table><tr><th>Timezone</th><th>Date & Time</th></tr>';
            timezones.forEach(tz => {
                html += `<tr><td>${tz.name} (${tz.zone})</td><td>${formatDate(dateTime, tz.zone)}</td></tr>`;
            });
            html += '</table>';
            resultDiv.innerHTML = html;
        }

        form.addEventListener('submit', (e) => {
            e.preventDefault();
            const inputDate = new Date(dateTimeInput.value);
            const inputTimezone = timezoneSelect.value;
            const utcDate = new Date(inputDate.toLocaleString('en-US', { timeZone: 'UTC' }));
            updateUrlHash(utcDate, inputTimezone);
            displayResults(utcDate, inputTimezone);
        });

        function setDateTimeInputValue(date, timezone) {
            const localDate = new Date(date.toLocaleString('en-US', { timeZone: timezone }));
            dateTimeInput.value = localDate.toISOString().slice(0, 16);
        }

        window.addEventListener('load', () => {
            const hashData = getDateTimeFromHash();
            if (hashData) {
                timezoneSelect.value = hashData.timezone;
                setDateTimeInputValue(hashData.dateTime, hashData.timezone);
                displayResults(hashData.dateTime, hashData.timezone);
            } else {
                setDateTimeInputValue(new Date(), userTimezone);
            }
        });

        window.addEventListener('hashchange', () => {
            const hashData = getDateTimeFromHash();
            if (hashData) {
                timezoneSelect.value = hashData.timezone;
                setDateTimeInputValue(hashData.dateTime, hashData.timezone);
                displayResults(hashData.dateTime, hashData.timezone);
            }
        });
    </script>
</body>
</html>

I've updated the timezone converter tool to include the ability to select a timezone when picking the time. Here are the key changes and new features:

  1. Added a select box for choosing the input timezone.
  2. The user's detected timezone is now set as the default option in the select box.
  3. The selected timezone is preserved in the URL hash along with the timestamp.
  4. The tool now correctly handles conversions from the selected input timezone.
  5. The list of timezones now includes UTC as an option.

Here's a breakdown of the main changes:

  1. Added a <select> element for timezone selection in the HTML form.
  2. Populated the timezone select box with options including UTC and common timezones.
  3. Updated the updateUrlHash function to include the selected timezone in the URL hash.
  4. Modified the getDateTimeFromHash function to parse both the timestamp and timezone from the URL hash.
  5. Updated the form submission handler to account for the selected input timezone when converting times.
  6. Added a setDateTimeInputValue function to properly set the input field's value based on the selected timezone.
  7. Modified the load and hashchange event listeners to handle the new timezone information from the URL hash.

To use this updated tool:

  1. Save the HTML content to a file (e.g., timezone-converter.html).
  2. Open the file in a modern web browser.
  3. The date/time input will default to the current time in your detected timezone.
  4. Select a date, time, and timezone from the dropdowns.
  5. Click "Convert" to see the time converted to various timezones.
  6. The URL will update with a hash containing the timestamp and selected timezone.
  7. You can share this URL, and when others open it, they'll see the same time converted to their local timezone and other listed timezones.

This updated version provides more flexibility for users to input times from different timezones while still maintaining the ease of use and sharing capabilities of the original version.

Would you like me to explain any part of the code in more detail or make any further modifications to the tool?

human (Jul 4, 2024, 01:14 PM)

Ditch the convert button - update the table and the # URL constantly as the user modifies the settings

assistant (Jul 4, 2024, 01:14 PM)

Certainly! I'll modify the tool to update the table and URL hash in real-time as the user changes the date, time, or timezone. This will make the tool more responsive and user-friendly.

create Real-time Timezone Converter Tool

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Real-time Timezone Converter</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
        form {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            margin-bottom: 20px;
        }
        label {
            margin-right: 5px;
        }
    </style>
</head>
<body>
    <h1>Real-time Timezone Converter</h1>
    <form id="timeForm">
        <label for="dateTime">Select Date and Time:</label>
        <input type="datetime-local" id="dateTime" required>
        <label for="timezone">in timezone:</label>
        <select id="timezone"></select>
    </form>
    <div id="result"></div>

    <script>
        const dateTimeInput = document.getElementById('dateTime');
        const timezoneSelect = document.getElementById('timezone');
        const resultDiv = document.getElementById('result');

        const timezones = [
            { name: 'UTC', zone: 'UTC' },
            { name: 'New York', zone: 'America/New_York' },
            { name: 'Los Angeles', zone: 'America/Los_Angeles' },
            { name: 'Chicago', zone: 'America/Chicago' },
            { name: 'London', zone: 'Europe/London' },
            { name: 'Paris', zone: 'Europe/Paris' },
            { name: 'Tokyo', zone: 'Asia/Tokyo' },
            { name: 'Sydney', zone: 'Australia/Sydney' },
            { name: 'Dubai', zone: 'Asia/Dubai' },
            { name: 'Moscow', zone: 'Europe/Moscow' }
        ];

        const userTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;

        // Populate timezone select
        timezones.forEach(tz => {
            const option = document.createElement('option');
            option.value = tz.zone;
            option.textContent = `${tz.name} (${tz.zone})`;
            timezoneSelect.appendChild(option);
        });

        // Set default timezone to user's timezone
        timezoneSelect.value = userTimezone;

        function updateUrlHash(dateTime, timezone) {
            const timestamp = dateTime.getTime();
            history.replaceState(null, null, `#${timestamp},${timezone}`);
        }

        function getDateTimeFromHash() {
            const hash = window.location.hash.slice(1);
            if (hash) {
                const [timestamp, timezone] = hash.split(',');
                return {
                    dateTime: new Date(parseInt(timestamp)),
                    timezone: timezone || userTimezone
                };
            }
            return null;
        }

        function formatDate(date, timezone) {
            return date.toLocaleString('en-US', { timeZone: timezone, dateStyle: 'full', timeStyle: 'long' });
        }

        function displayResults(dateTime, inputTimezone) {
            let html = '<table><tr><th>Timezone</th><th>Date & Time</th></tr>';
            timezones.forEach(tz => {
                html += `<tr><td>${tz.name} (${tz.zone})</td><td>${formatDate(dateTime, tz.zone)}</td></tr>`;
            });
            html += '</table>';
            resultDiv.innerHTML = html;
        }

        function updateResults() {
            const inputDate = new Date(dateTimeInput.value);
            const inputTimezone = timezoneSelect.value;
            const utcDate = new Date(inputDate.toLocaleString('en-US', { timeZone: 'UTC' }));
            updateUrlHash(utcDate, inputTimezone);
            displayResults(utcDate, inputTimezone);
        }

        function setDateTimeInputValue(date, timezone) {
            const localDate = new Date(date.toLocaleString('en-US', { timeZone: timezone }));
            dateTimeInput.value = localDate.toISOString().slice(0, 16);
        }

        // Event listeners for real-time updates
        dateTimeInput.addEventListener('input', updateResults);
        timezoneSelect.addEventListener('change', updateResults);

        window.addEventListener('load', () => {
            const hashData = getDateTimeFromHash();
            if (hashData) {
                timezoneSelect.value = hashData.timezone;
                setDateTimeInputValue(hashData.dateTime, hashData.timezone);
                displayResults(hashData.dateTime, hashData.timezone);
            } else {
                setDateTimeInputValue(new Date(), userTimezone);
                updateResults();
            }
        });

        window.addEventListener('hashchange', () => {
            const hashData = getDateTimeFromHash();
            if (hashData) {
                timezoneSelect.value = hashData.timezone;
                setDateTimeInputValue(hashData.dateTime, hashData.timezone);
                displayResults(hashData.dateTime, hashData.timezone);
            }
        });
    </script>
</body>
</html>

I've updated the timezone converter tool to update in real-time as the user modifies the settings. Here are the key changes:

  1. Removed the "Convert" button from the form.
  2. Added event listeners to both the date/time input and timezone select to trigger updates immediately when changed.
  3. Modified the URL hash update to use history.replaceState() instead of directly changing window.location.hash to prevent unnecessary history entries.
  4. Simplified the form structure and removed the submit event listener.

Here's a breakdown of the main changes:

  1. Removed the submit button and form submit event listener.
  2. Added input event listener to dateTimeInput: 
    dateTimeInput.addEventListener('input', updateResults);
  3. Added change event listener to timezoneSelect: 
    timezoneSelect.addEventListener('change', updateResults);
  4. Modified the updateUrlHash function to use history.replaceState(): 
    function updateUrlHash(dateTime, timezone) {
    const timestamp = dateTime.getTime();
    history.replaceState(null, null, `#${timestamp},${timezone}`);
}
  5. Created a new updateResults function that handles updating both the URL hash and the displayed results: 
    function updateResults() {
    const inputDate = new Date(dateTimeInput.value);
    const inputTimezone = timezoneSelect.value;
    const utcDate = new Date(inputDate.toLocaleString('en-US', { timeZone: 'UTC' }));
    updateUrlHash(utcDate, inputTimezone);
    displayResults(utcDate, inputTimezone);
}

To use this updated tool:

  1. Save the HTML content to a file (e.g., timezone-converter.html).
  2. Open the file in a modern web browser.
  3. The date/time input will default to the current time in your detected timezone.
  4. As you change the date, time, or timezone, the conversion table and URL will update in real-time.
  5. You can still share the URL, and when others open it, they'll see the same time converted to their local timezone and other listed timezones.

This version provides an even more responsive and interactive experience for users, allowing them to see the effects of their changes immediately without needing to click a button.

Would you like me to explain any part of the code in more detail or make any further modifications to the tool?

human (Jul 4, 2024, 01:15 PM)

Uncaught Error: Script error.

assistant (Jul 4, 2024, 01:15 PM)

I apologize for the error. It seems there might be an issue with the JavaScript code that isn't immediately apparent. Let's troubleshoot this by simplifying the code and adding some error handling to help identify where the problem might be occurring.

Here's an updated version with additional error handling and logging:

create Real-time Timezone Converter Tool with Error Handling

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Real-time Timezone Converter</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
        form {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            margin-bottom: 20px;
        }
        label {
            margin-right: 5px;
        }
        #error {
            color: red;
            font-weight: bold;
        }
    </style>
</head>
<body>
    <h1>Real-time Timezone Converter</h1>
    <form id="timeForm">
        <label for="dateTime">Select Date and Time:</label>
        <input type="datetime-local" id="dateTime" required>
        <label for="timezone">in timezone:</label>
        <select id="timezone"></select>
    </form>
    <div id="error"></div>
    <div id="result"></div>

    <script>
        const dateTimeInput = document.getElementById('dateTime');
        const timezoneSelect = document.getElementById('timezone');
        const resultDiv = document.getElementById('result');
        const errorDiv = document.getElementById('error');

        const timezones = [
            { name: 'UTC', zone: 'UTC' },
            { name: 'New York', zone: 'America/New_York' },
            { name: 'Los Angeles', zone: 'America/Los_Angeles' },
            { name: 'Chicago', zone: 'America/Chicago' },
            { name: 'London', zone: 'Europe/London' },
            { name: 'Paris', zone: 'Europe/Paris' },
            { name: 'Tokyo', zone: 'Asia/Tokyo' },
            { name: 'Sydney', zone: 'Australia/Sydney' },
            { name: 'Dubai', zone: 'Asia/Dubai' },
            { name: 'Moscow', zone: 'Europe/Moscow' }
        ];

        try {
            const userTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
            console.log('User timezone:', userTimezone);

            // Populate timezone select
            timezones.forEach(tz => {
                const option = document.createElement('option');
                option.value = tz.zone;
                option.textContent = `${tz.name} (${tz.zone})`;
                timezoneSelect.appendChild(option);
            });

            // Set default timezone to user's timezone
            timezoneSelect.value = userTimezone;

            function updateUrlHash(dateTime, timezone) {
                const timestamp = dateTime.getTime();
                history.replaceState(null, null, `#${timestamp},${timezone}`);
            }

            function getDateTimeFromHash() {
                const hash = window.location.hash.slice(1);
                if (hash) {
                    const [timestamp, timezone] = hash.split(',');
                    return {
                        dateTime: new Date(parseInt(timestamp)),
                        timezone: timezone || userTimezone
                    };
                }
                return null;
            }

            function formatDate(date, timezone) {
                return date.toLocaleString('en-US', { timeZone: timezone, dateStyle: 'full', timeStyle: 'long' });
            }

            function displayResults(dateTime, inputTimezone) {
                let html = '<table><tr><th>Timezone</th><th>Date & Time</th></tr>';
                timezones.forEach(tz => {
                    html += `<tr><td>${tz.name} (${tz.zone})</td><td>${formatDate(dateTime, tz.zone)}</td></tr>`;
                });
                html += '</table>';
                resultDiv.innerHTML = html;
            }

            function updateResults() {
                try {
                    console.log('Updating results...');
                    const inputDate = new Date(dateTimeInput.value);
                    console.log('Input date:', inputDate);
                    const inputTimezone = timezoneSelect.value;
                    console.log('Input timezone:', inputTimezone);
                    const utcDate = new Date(inputDate.toLocaleString('en-US', { timeZone: 'UTC' }));
                    console.log('UTC date:', utcDate);
                    updateUrlHash(utcDate, inputTimezone);
                    displayResults(utcDate, inputTimezone);
                    errorDiv.textContent = '';
                } catch (error) {
                    console.error('Error in updateResults:', error);
                    errorDiv.textContent = 'Error updating results: ' + error.message;
                }
            }

            function setDateTimeInputValue(date, timezone) {
                const localDate = new Date(date.toLocaleString('en-US', { timeZone: timezone }));
                dateTimeInput.value = localDate.toISOString().slice(0, 16);
            }

            // Event listeners for real-time updates
            dateTimeInput.addEventListener('input', updateResults);
            timezoneSelect.addEventListener('change', updateResults);

            window.addEventListener('load', () => {
                try {
                    console.log('Window loaded');
                    const hashData = getDateTimeFromHash();
                    if (hashData) {
                        console.log('Hash data:', hashData);
                        timezoneSelect.value = hashData.timezone;
                        setDateTimeInputValue(hashData.dateTime, hashData.timezone);
                        displayResults(hashData.dateTime, hashData.timezone);
                    } else {
                        console.log('No hash data, using current time');
                        setDateTimeInputValue(new Date(), userTimezone);
                        updateResults();
                    }
                } catch (error) {
                    console.error('Error in load event:', error);
                    errorDiv.textContent = 'Error loading initial data: ' + error.message;
                }
            });

            window.addEventListener('hashchange', () => {
                try {
                    console.log('Hash changed');
                    const hashData = getDateTimeFromHash();
                    if (hashData) {
                        console.log('New hash data:', hashData);
                        timezoneSelect.value = hashData.timezone;
                        setDateTimeInputValue(hashData.dateTime, hashData.timezone);
                        displayResults(hashData.dateTime, hashData.timezone);
                    }
                } catch (error) {
                    console.error('Error in hashchange event:', error);
                    errorDiv.textContent = 'Error processing URL: ' + error.message;
                }
            });

        } catch (error) {
            console.error('Initialization error:', error);
            errorDiv.textContent = 'Initialization error: ' + error.message;
        }
    </script>
</body>
</html>

In this updated version, I've made the following changes to help identify and handle potential errors:

  1. Added a try-catch block around the entire script to catch any initialization errors.
  2. Added try-catch blocks in the updateResults, load, and hashchange event handlers to catch and display any errors that occur during these operations.
  3. Added more console.log statements throughout the code to help track the flow of execution and identify where problems might be occurring.
  4. Added an error display div to show any error messages directly on the page.

To use this updated version:

  1. Save the HTML content to a file (e.g., timezone-converter.html).
  2. Open the file in a modern web browser.
  3. Open the browser's developer console (usually F12 or right-click and select "Inspect") to see any logged messages or errors.

If you still encounter the "Script error" or any other issues, please check the browser's console for more detailed error messages and let me know what you see. This will help us pinpoint the exact cause of the problem and make further adjustments as needed.

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