ICS Timezone Fix

A lightweight web service to fix timezone issues in .ics calendar files (from Outlook, Office365, etc.) so Google Calendar and other apps display event times correctly.

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Features

• Accepts a public .ics calendar URL and injects missing timezone definitions.
• Ensures compatibility with Google Calendar and other calendar apps.
• Fast, privacy-friendly (no data stored).
• Modern, user-friendly web interface.
• CORS enabled for easy integration.

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How to Run Locally

1. Clone the repository:

   git clone https://github.com/maiiku/ics-timezone-fix.git
   cd ics-timezone-fix

2. Create and activate a virtual environment:

   python3 -m venv venv
   source venv/bin/activate

3. Install dependencies:

   pip install -r requirements.txt

4. Run the app:

   python3 app.py

5. Open in your browser: Go to http://127.0.0.1:8000/

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Usage

• Instructions page: Open the app in your browser with no parameters to see friendly usage instructions.
• Fix a calendar: Add your .ics file URL as a query parameter, e.g.:

  http://127.0.0.1:8000/?ics_url=https://example.com/calendar.ics
  

• The app will return a fixed .ics file for download.

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Example

https://your-server.com/?ics_url=https://original-calendar-url.ics

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License

This project is licensed under the GNU General Public License v3.0. See LICENSE for details.