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Auto Dark Mode Scheduler – Online Custom Time Switch

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Auto Dark Mode Scheduler

Set custom times to automatically switch between dark and light mode on your website

Light Mode Active
Current: --:--:--
NEXT --:--:--
Switches to Dark at --:--
Light Mode
Schedule Settings
Dark mode duration: 12h 0m
Light mode duration: 12h 0m
Crosses midnight
Generated JavaScript
// Auto Dark Mode Scheduler // Paste this script before </body> const DARK_START = "19:00"; // Dark mode start const DARK_END = "07:00"; // Dark mode end function isDarkMode() { const now = new Date(); const m = now.getHours() * 60 + now.getMinutes(); const [sh, sm] = DARK_START.split(":").map(Number); const [eh, em] = DARK_END.split(":").map(Number); const start = sh * 60 + sm; const end = eh * 60 + em; if (start <= end) return m >= start && m < end; return m >= start || m < end; } function applyMode() { document.documentElement.classList.toggle("dark-mode", isDarkMode()); } applyMode(); setInterval(applyMode, 60000); // Check every minute

Tip: Add .dark-mode CSS styles to customize your dark theme colors.

Live Preview
Light
example.com
Welcome to Your Site
This is a live preview showing how your website looks in the currently active mode. The colors, backgrounds, and text adapt based on your schedule settings.
đź“Š
Analytics
đź””
Notifications
⚙️
Settings
Latest Update
Auto dark mode scheduling is now active! Your visitors will enjoy a comfortable viewing experience at any time of day.
Preview updates in real-time based on your schedule — Next switch: --:--

Frequently Asked Questions

What is an Auto Dark Mode Scheduler?

An Auto Dark Mode Scheduler is a tool that automatically switches your website between dark and light color themes based on a custom time schedule you define. It enhances user experience by reducing eye strain during nighttime browsing while maintaining readability during daylight hours. Unlike system-level dark mode (prefers-color-scheme), a scheduler gives you precise control over when the switch happens.

How does the time-based dark mode switch work?

The tool generates a lightweight JavaScript snippet that runs in the visitor's browser. It checks the local time every minute and compares it against your configured start and end times. When the current time falls within the dark mode window, a CSS class (dark-mode) is added to the <html> element, triggering your dark theme styles. The scheduler correctly handles schedules that cross midnight (e.g., 10 PM to 6 AM).

Can I combine this with system preference detection?

Yes! For the best user experience, you can combine time-based scheduling with the CSS prefers-color-scheme media query as a fallback. Use the scheduler to override the system preference during specific hours, or let the system preference take over when no schedule is active. The generated code can be easily extended to check both conditions.

What happens if a user has JavaScript disabled?

If JavaScript is disabled, the time-based scheduler won't function. However, you can provide a fallback using the CSS prefers-color-scheme media query, which works natively in modern browsers without JavaScript. We recommend implementing both: the scheduler as the primary method and the media query as a graceful fallback for non-JS users.

Does the scheduler account for different time zones?

The scheduler uses the visitor's local time (via the browser's Date object), meaning it automatically adapts to each user's time zone. If a user in New York visits your site at 8 PM EST, they'll see the dark mode if your schedule includes that time — while a user in London at the same moment may see light mode based on their local time.

How do I style the dark mode for my website?

Once the dark-mode class is added to your <html> element, you can define corresponding CSS rules. For example: .dark-mode body { background: #1a1a2e; color: #e0e0e0; }. Use CSS custom properties (variables) for a more maintainable approach — define your color palette under :root for light mode and override them under .dark-mode for dark mode.

Is this tool free to use?

Yes! This Auto Dark Mode Scheduler is completely free to use. You can generate unlimited code snippets, test different schedules in the live preview, and copy the JavaScript code to embed on any website — personal or commercial. No registration or payment is required.

Eye Comfort

Reduce blue light exposure during evening hours. Dark mode at night helps minimize eye strain and may improve sleep quality for your visitors.

Lightweight Script

The generated JavaScript is under 1KB, runs efficiently with minimal CPU usage, and uses setInterval with 60-second checks for optimal performance.

Universal Compatibility

Works on all modern browsers including Chrome, Firefox, Safari, and Edge. Respects user time zones automatically with no server-side configuration needed.

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