The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Day of Week in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 561st edsrzf 🇳🇿 880 66 12ms 1 Sep 2025 561st pardouin 🇫🇷 880 66 12ms 1 Sep 2025 561st DialFrost 🇸🇬 880 66 11ms 6 Sep 2025 561st snoozingnewt 🇨🇦 880 66 12ms 9 days ago 565th dezconnect 878 93 14ms 26 Jun 2023 565th arjunprakash027 878 93 22ms 8 Aug 2025 565th butnaruteodor 878 93 14ms 31 Oct 2025 568th michelebastione 🇮🇹 877 67 399ms 20 Dec 2023 568th gblikas 877 67 391ms 18 Aug 2024 570th Shanethegamer 🇺🇸 877 77 1,235ms 26 Oct 2023 570th JayXon 🇺🇸 877 77 1,314ms 27 Oct 2023 570th JDiLenarda 🇫🇷 877 77 1,305ms 24 Nov 2023 573rd Steffan153 🇫🇮 877 98 9ms 1 Jun 2024 573rd IanUtley 877 98 9ms 28 Jun 2024 575th BREMAUCY 🇫🇷 876 85 372ms 14 days ago 576th NickTheEASDude 🇺🇸 875 77 50ms 26 Jan 2024 576th Moreallure 875 77 54ms 4 May 2024 576th Protothor 875 77 49ms 3 Jul 2025 579th snoozingnewt 🇨🇦 874 50 3ms 9 days ago 580th Steffan153 🇫🇮 873 79 196ms 10 Aug 2024 580th ovs-code 🇩🇪 873 79 203ms 17 Apr 2025 580th pardouin 🇫🇷 873 79 198ms 17 Apr 2025 583rd emplv 🇱🇻 872 50 5ms 16 Apr 2023 583rd oddvalue 872 50 5ms 4 Aug 2023 583rd janbehrens 🇩🇪 872 50 5ms 4 Aug 2023 583rd DialFrost 🇸🇬 872 50 5ms 6 Dec 2023 583rd Pimentero 🇷🇺 872 50 5ms 15 Apr 2024 588th IanUtley 872 69 15ms 23 Aug 2023 588th annaproxy 872 69 16ms 2 Sep 2023 590th Shanethegamer 🇺🇸 871 110 129ms 16 Apr 2023 590th Steffan153 🇫🇮 871 110 128ms 16 Apr 2023 590th JayXon 🇺🇸 871 110 129ms 21 Apr 2023 590th MeWhenI 🇻🇦 871 110 129ms 15 May 2023 590th Lydxn 🇨🇦 871 110 130ms 26 May 2023 590th stefangimmillaro 871 110 127ms 20 Jun 2023 590th voytxt 🇨🇿 871 110 132ms 1 Jan 2024 590th sean-niemann 🇺🇸 871 110 129ms 20 Jul 2024 590th edsrzf 🇳🇿 871 110 126ms 1 Jun 2025 590th Yax42 🇫🇷 871 110 127ms 7 Oct 2025 590th snoozingnewt 🇨🇦 871 110 133ms 9 days ago 601st hellwue 869 94 32ms 28 Apr 2023 601st eiburns 869 94 32ms 28 Apr 2023 601st jmerle 🇳🇱 869 94 13ms 15 Jun 2023 601st Vaekor 869 94 13ms 9 Jul 2023 601st anonymaew 869 94 14ms 19 Aug 2023 601st epic-programmer-guy 869 94 13ms 21 Dec 2023 601st Jaydosu 869 94 15ms 28 Jun 2024 601st Schreipfelerer 869 94 13ms 11 Sep 2024 601st sheeperino 🇮🇹 869 94 14ms 12 Oct 2024 601st Europe2048 869 94 14ms 30 Nov 2024 601st Artemis21 🇬🇧 869 94 14ms 2 Jan 2025 601st lelbal 869 94 13ms 6 Nov 2025 613th madex 🇩🇪 869 98 2ms 6 Aug 2023 614th weliveinhell 🇭🇹 867 123 273ms 1 Oct 2023 614th jerrandolph 867 123 267ms 20 Oct 2023 614th r3vit 867 123 268ms 27 Dec 2023 614th ibeucaly 867 123 272ms 26 Apr 2025 614th snoozingnewt 🇨🇦 867 123 247ms 17 Oct 2025 619th Lydxn 🇨🇦 866 78 1,282ms 26 May 2023 619th Yewzir 🇧🇪 866 78 1,251ms 4 Jul 2023 619th Steffan153 🇫🇮 866 78 1,294ms 10 Aug 2024 619th edsrzf 🇳🇿 866 78 1,321ms 15 Nov 2024 623rd edsrzf 🇳🇿 865 84 126ms 24 May 2025 623rd JayXon 🇺🇸 865 84 168ms 24 May 2025 625th 2bular 865 95 3ms 3 Aug 2025 626th JayXon 🇺🇸 865 222 210ms 5 days ago 627th ccolella-mdc 864 68 415ms 12 Oct 2023 628th cryosis7 864 78 48ms 23 Aug 2023 628th jbt 864 78 49ms 26 Dec 2023 628th rastapasta 864 78 49ms 7 Aug 2024 631st JayXon 🇺🇸 863 140 395ms 30 Oct 2024 632nd JayXon 🇺🇸 863 142 509ms 14 Jul 2023 632nd Shanethegamer 🇺🇸 863 142 517ms 14 Jul 2023 632nd Lydxn 🇨🇦 863 142 480ms 14 Jul 2023 632nd sean-niemann 🇺🇸 863 142 487ms 20 Jul 2024 632nd Steffan153 🇫🇮 863 142 477ms 20 Jul 2024 637th voytxt 🇨🇿 862 80 206ms 3 Aug 2024 637th GrayJoKing 🇦🇺 862 80 203ms 12 Aug 2024 639th 2bular 862 81 41ms 18 Oct 2025 640th primo-ppcg 🇹🇭 862 94 3,593ms 21 Apr 2023 First Prev 561–640 of 1,437 Next Last