This is a dynamic version of Randall Munroe's xkcd webcomic "Unique Date".
See it in action on https://voidptr.de/xkcd-1340 (updated at midnight UTC).
Use the bash script today.sh to generate a today.png with the current date (or set up a cronjob to do that).
The script requires ImageMagick to combine the various image parts.
Artwork by Randall Munroe, image chopping and bash scripting by n.st.