CalendarChanger

A personal fix for the messy University of Twente (TimeEdit) calendar exports.

Before	After

CalendarChanger is a small web app that sits between TimeEdit and your preferred calendar app.
It takes the .ics feeds from TimeEdit, cleans them up, and republishes them as nice, structured calendars you can actually use.
All your events stay up to date automatically, but with proper names, times, and mazemap links.

Why

TimeEdit’s calendar export is functional, but not practical.
Events come with unreadable titles, random types, and no MazeMap links.
I built CalendarChanger to solve that — and because the .ics format works everywhere (Apple Calendar, Google Calendar, Outlook, etc.) without vendor lock-in.

What It Does

• Cleans event titles – turns Wireless Communication Systems, 202400588 into Wireless Communication Systems.
• Renaming rules – rename all events matching DEMS to Distributed Energy Management Systems
• Lets you override details – rename events, adjust times, or hide them completely.
  • Example: TimeEdit says 8:45–17:00 but you only present from 14:00–15:00, now you can rename the event to Presentation and edit the start and end time.
  • Passed an exam and don’t need the resit? Hide it and keep your calendar tidy.
• Adds MazeMap links – opens the correct UTwente room or building directly.
• Splits calendars by type – create feeds like /Lectures, /Exams, /Workshops so you can color-code them differently in your calendar app.
• Runs anywhere – lightweight, single Docker container, self-hosted in minutes.

Setup

Quick Deploy with Docker Compose

Create a file named docker-compose.yml:

services:
    calendar-changer:
        image: ghcr.io/wtb04/calendarchanger:latest
        ports:
            - "8080:8080"
        environment:
            ApiKey: "password"
        volumes:
            - ./data:/app/data

then run

docker compose up -d

Visit http://localhost:8088 and log in using the ApiKey you configured.

In Settings, fill in the following fields:

• Base URL – for local setups, use http://localhost:8080.
  This value controls how links inside calendar events are generated (for example, MazeMap directions and edit links).
  It does not affect how you access the web portal itself.
  However, the address you set here should still resolve to your running instance of CalendarChanger,
  since calendar clients will follow those links back to the web portal to open event details or maps.
• Rooster URLs – add one or more .ics links from TimeEdit.
  When copying these URLs, make sure to set the period to match your current semester (for example 2025/2026 1A).
  This ensures the feed includes all events for that period, not just the next four weeks.

Once saved, your merged and cleaned calendar will be available at:
http://localhost:8080/other

You can also create custom endpoints to separate event types.
For example, add an endpoint named exams and include the types:
exam, exam chromebook, presentation(s)

These matching events will then be removed from /other and instead appear under:
http://localhost:8080/exams

Made by Wouter ten Brinke, with a write-up of the project on my site.