A short 923 days ago, I launched a little tool with a blog post titled Mathematical Anniversaries. It was fairly simple - it would tell you when 1,000 days had passed, or 50 Mercury years - and give you plenty more excuses to demand birthday or anniversary presents!
I have meant to move it to its own domain and give it an update, almost since launching the tool here, and have been working on it since then from time to time. Among other things, I wanted to tidy up the code, add some more events, and add some email notifications.
Finally, it is done and ready for the big bad real world. Please take a moment to check it out, at Mathaversaries.com!