Weekle – a web app to learn how to calculate the day of the week
Mentally calculating the day-of-the-week for any date in history sounds like an impossible task for a normal person, but the algorithm is actually pretty simple to learn. Although there are tutorials for this elsewhere online, and little quizzes available, there didn't seem to be anything well optimised with multiple practice modes etc. I originally created a basic version of this just for myself, but a small group of friends and family found it interesting and gave suggestions such as the daily game. Multi-lingual support is a bit rudimentary at the moment, it will only translate the month…
Weekle – a web app to learn how to calculate the day of the week launched on May 19, 2023 with 122 votes, #360 of 4,910 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
Weekle is a web app that teaches users to mentally calculate the day of the week for any historical date. It offers multiple practice modes including a daily game, making the surprisingly simple algorithm accessible to learn. The app is designed for anyone interested in developing this mental math skill, with support for multiple languages covering month and weekday names.
written from the facts on this page · September 2026
From the sources
Seamlessly transitioning to Mercator upon zoom
Recently the UN passed the non-binding "Correct the Map" resolution which encourages the use of the Equal Earth projection in place of Mercator (which represents country-sizes disproportionately). The Mercator projection is well suited to zoomable/navigation maps due to being "conformal", meaning it represents directions accurately. At a global scale Equal Earth may look pretty good, but it's not what web and mobile based apps typically require. I present an alternative. The map below is equal-area at a global scale, and upon zoom, it transitions seamlessly to the Mercator projection. It is defined by an unusually simple math formula. The hybrid nature of the map is baked into the very…from benjoffe.com
In the maker’s words, at launch
Mentally calculating the day-of-the-week for any date in history sounds like an impossible task for a normal person, but the algorithm is actually pretty simple to learn. Although there are tutorials for this elsewhere online, and little quizzes available, there didn't seem to be anything well optimised with multiple…
Does a similar job
all alternatives →- HTHow to mentally calculate the day of the week for any dateAug 2026 · tinkerandsee.com · ▲80
A daily math puzzle inspired by Wordle2022 · mathler.com · ▲111
Countle2022 · countle.org · ▲152Countle is a daily puzzle game, a la Wordle, where you use 6 given numbers to produce of a sequence of calculations to reach a target number. In other words, it's a daily round of the "Numbers Game" from the British game show Countdown. Sample numbers round: https://www.youtube.com/watch?v=pfa3MHLLSWI A new puzzle appears every day!
I made a web game that makes practicing basic arithmetic fun2024 · worchle.com · ▲161Hey, maker here. After launching a daily word search game, I randomly thought of this math game while driving. Finally got around to making it and I think it turned out pretty cool. It’s a math search game that’s meant to help you practice your quick addition, subtraction, multiplication, and division skills. I’m hoping it’ll help people (even those like me who aren’t big on math) learn and increase their speeds. (There are also some settings you can enable to make the game harder) If you try it out, please let me know if you found it fun, if you have anything you’d like me to add, or if you…
Questions this answers
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Source: Show HN post ↗ · launch text quoted in part
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