Some people use legacy paper-based advent calendar technology, but I use cloud-based time tracking technology.

Downloading http://curlmas.dbatley.com/ will finish on Christmas morning, and the progress bar of curl gives the percentage of advent which has happened.

Run with python3 curlmas.py

Test with a webbrowser or:

(echo $'GET / HTTP/1.1\r\n\r\n' && cat) | nc localhost 2525

License: GPLv3 or later

SVG images from: https://openclipart.org/ (cc-zero)

This is a silly thing hacked together quickly, it probably has lots of bugs.

It currently sends one byte every 5 seconds, which means the total size is about 500 KB. If you include the tcp packet headers, etc, it would be about 64 times that size (32MB).