Time Theme Switcher

Switch Blender between your favorite light and dark interface themes on a schedule. The add-on schedule a timer and applies your chosen presets automatically.

Features

• 🌅 Time-based switching – configure independent light/dark activation times (default 07:00 and 19:00).
• 🎨 Theme presets – pick any interface preset file (*.xml) already shipped with Blender or one of your own.
• 🔁 Persistent timer – background timer ensures the correct theme is always active, even after reopening Blender. It also makes sure to re-eschedule whenever you adjust times.
• 🧰 Safe fallbacks – the add-on gracefully handles invalid schedules and missing presets by reverting to Blender's stock themes.

Requirements

• Blender 3.6.0 or newer (tested up to Blender 5.1)

Usage

1. Open Edit → Preferences → Add-ons → Interface ▸ Time Theme Switcher.
2. Check Time Theme Switcher to enable automatic switching.
3. Pick the light and dark preset files via the menu buttons. The add-on scans Blender's preset directories, so stock files like Blender_Light.xml and Blender_Dark.xml appear automatically.
4. Set the activation times (24-hour format).

Manual override

• Use the preset menus to pick a different theme file at any time.
• Click Refresh after drastically changing the system clock, so the timer recalculates immediately.

Scheduling Logic

• The add-on converts each schedule into minutes since midnight and determines whether the current time lies in the "light" or "dark" window.
• Default schedule: 07:00 light / 19:00 dark. These values are stored per-user and ship with sensible fallbacks.

License

This project is released under the GNU General Public License v3.0 or later. See the license file for the full text and your rights.