[CalDAV](https://en.wikipedia.org/wiki/CalDAV) is a calendaring extension to
WebDAV, an HTTP-based protocol that allows to read, write and alter files, directories and file properties.
The calendar data can be stored in memory, on disk, or in a
git repository using [irmin](https://github.com/mirage/irmin).
We tested interoperability with most common CalDAV clients (DAVdroid on Android, Thunderbird Lightning on Linux/Unix/Windows, Apple
calendar app on MacOS and iOS).
## How to try the calendar server
There is a live instance for testing available at `calendar.robur.io`.
There is a test user called `test` with password `password` for your convenience.
If you use MacOS, you need add a new CalDAV account in the calendar app, set it to manual, and enter the above URL, username and password.
For iOS you need to add an account in the calendar app, select "other" and then CalDAV.
Discovery of calendars happens automatically.
If you use Thunderbird Lightning, you need to create a new calendar on the network, select CalDAV as remote calendar format, and enter a full calendar URL, e.g.
