Martijn launched i18n-puzzles.com—20 daily brainteasers released during a March 2025 online event—to make time zones and Unicode fun. Challenges range from a UTF-8 treasure hunt and parsing right-to-left scam text to juggling parallel time-zone databases for a science problem. Over 300 developers from around the globe competed, tackling ever-more advanced internationalization quirks.
Now it’s time to dive into the solutions: what clever approaches emerged, and how do Java, JavaScript and other languages differ in handling these I18N headaches? This talk walks through the best code snippets and shares pro tips on mastering time zones and Unicode.
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