Ben Joffe

I am software developer in Sydney.
Recently, in my spare time I have worked on computer algorithms for calendar-date and timestamp conversion, for both Earth and Mars. Some of these algorithms are the fastest in their class, and have been adopted by LLVM and Webkit.

I also have a deep interest in mathematics and cartography. I have developed a range of novel map projections that will be released in the coming months.

Map Projections:

• 15 September 2026A New Equal-Area Map for Interactive Computer UseSeamlessly transitioning to Mercator when zooming

The Fast-Date Series:

• 7 September 2026A faster way to calculate the Time of Day50% faster than usual, by breaking the dependency chain
• 17 August 2026A faster way to calculate the Day of the WeekA range of fast modulus techniques that beat compiler output
• 11 December 2025The fastest “Is Leap Year” functionsShowcasing techniques from various algorithm designers
• 23 November 2025A Very Fast 64–Bit Date Algorithm: 30-40% fasterThe first date algorithm to use only 4 multiplications, instead of 7+
• 10 November 2025A New Faster Overflow–Safe Date Algorithm12-17% faster than previous algorithms, supporting the full 32–bit input range.
• 3 November 2025A New Faster Algorithm for Gregorian Date Conversion...how "Century-February-Padding" beats traditional year slicing.

Date & Time on Mars

• 26 August 2025The Smoital SystemA method of timekeeping on Mars based on UTC

Older stuff:

• 12 Oct 2011Perfect Poker Coin Tosses
• 18 Sep 2010PocketOdds Launched
• 5 Sep 2010Omaha Ice Cold Decks
• 8 Feb 2010Torus Upgrade
• 5 Oct 2009Hold’em Ice Cold Decks