Getting sick can absolutely ruin plans, so here’s a way to get smarter about knowing when you might be sick.
Simply edit this file and start logging the weeks where you’re ill. Then, add the URL to Google Calendar (or any calendar that can import .ics files by URL) and you’ll see when you are typically sick.
Now when it’s time to make important plans, you can take into account the probability of you being sick at certain weeks.
PHP
You’ll want to edit the year you first started tracking your sick days so the probability calculation is accurate. Be sure to also change the timezone to match yours! You can debug the file by changing $debug to 1, then open the URL in a browser and view the source to see how the code is working.
