The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Leap Years 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 800th Walter225 889 80 58ms 10 Jul 2023 800th Mandrzejy 🇵🇱 889 80 60ms 22 Feb 2024 800th keelimeguy 🇺🇸 889 80 57ms 16 May 2025 800th GolfingSuccess 🇬🇷 889 80 61ms 2 Sep 2025 800th Andrey2001 889 80 80ms 25 days ago 806th MWI-polygolf 888 46 78ms 18 Feb 2023 806th steffan-polygolf 888 46 77ms 19 Feb 2023 806th DialFrost 🇸🇬 888 46 89ms 8 Nov 2023 806th dokutan 888 46 77ms 25 Sep 2024 810th GrayJoKing 🇦🇺 887 45 121ms 9 Feb 2022 810th sean-niemann 🇺🇸 887 45 119ms 12 Apr 2022 810th MeWhenI 🇻🇦 887 45 122ms 10 Oct 2022 810th Steffan153 🇫🇮 887 45 123ms 1 Jan 2023 810th MWI-polygolf 887 45 122ms 18 Feb 2023 810th steffan-polygolf 887 45 120ms 19 Feb 2023 810th DialFrost 🇸🇬 887 45 121ms 8 Nov 2023 810th AlephSquirrel 887 45 360ms 21 Jan 2024 810th m-tkach 🇺🇦 887 45 354ms 5 Feb 2024 810th neel11235813 887 45 355ms 2 Mar 2024 810th MeWhenI 🇻🇦 887 45 396ms 13 Jul 2024 810th dokutan 887 45 121ms 25 Sep 2024 810th dokutan 887 45 431ms 25 Sep 2024 810th CaedenHarper 🇨🇦 887 45 392ms 24 Jul 2025 810th Babafaba 887 45 422ms 24 days ago 825th andersk 🇺🇸 887 59 2ms 20 Mar 2020 825th uw4 887 59 1ms 29 Aug 2020 825th janbehrens 🇩🇪 887 59 2ms 22 May 2021 825th lynn 887 59 2ms 2 Oct 2021 825th simon-biber 887 59 2ms 7 Feb 2022 825th LorenzoDeGaspari 887 59 2ms 20 Jun 2022 825th solmyr2000 887 59 2ms 21 Jun 2022 825th AlephSquirrel 887 59 2ms 18 Jul 2022 825th Alex-x90 🇺🇸 887 59 2ms 24 Nov 2022 825th annaproxy 887 59 2ms 8 Jan 2023 825th b10011 🇫🇮 887 59 1ms 8 Jan 2023 825th orthoplex 🇨🇽 887 59 1ms 14 Jun 2024 825th yanjs 887 59 1ms 5 Jul 2025 825th luuumine 🇫🇷 887 59 1ms 29 Oct 2025 839th janbehrens 🇩🇪 886 38 371ms 1 Nov 2021 839th MeWhenI 🇻🇦 886 38 369ms 25 Nov 2022 841st villfa 886 50 4ms 27 May 2019 841st UpwardProcess 886 50 4ms 30 Jul 2019 841st ondras 886 50 4ms 3 May 2020 841st cywong-amino 🇭🇰 886 50 4ms 20 May 2020 841st Attero 🇸🇪 886 50 4ms 31 Aug 2020 841st sisyphus-ppcg 🇦🇺 886 50 7ms 5 Nov 2020 841st toubsen 🇩🇪 886 50 4ms 26 Dec 2020 841st fuzzylojik-golf 🇺🇸 886 50 4ms 28 Jun 2025 849th CaedenHarper 🇨🇦 886 90 257ms 12 Nov 2025 850th frankgraziano 886 132 11ms 3 Nov 2025 851st lynn 884 32 3ms 26 Mar 2021 851st perlebach 🇨🇿 884 32 2ms 13 Aug 2021 851st Steffan153 🇫🇮 884 32 3ms 24 Feb 2023 851st sean-niemann 🇺🇸 884 32 2ms 13 Mar 2025 855th yanjs 884 53 119ms 3 Jul 2025 856th Steffan153 🇫🇮 884 61 15ms 22 Aug 2024 857th daniel-skalik 🇨🇿 884 64 321ms 21 Nov 2021 857th fleischa 884 64 313ms 21 Nov 2021 857th Kloppermand 🇩🇰 884 64 321ms 21 Nov 2021 857th p-vf 🇨🇭 884 64 317ms 21 Nov 2021 857th raphaelimahorn 884 64 313ms 21 Nov 2021 857th revlayle 🇺🇸 884 64 313ms 21 Nov 2021 857th roavin 884 64 315ms 5 Jul 2022 857th dteague3989 884 64 327ms 26 May 2023 857th Decrare 884 64 358ms 12 Sep 2025 857th Andrey2001 884 64 378ms 24 days ago 867th prplz 🇦🇺 883 48 15ms 19 Sep 2019 867th TFeld00 🇩🇰 883 48 9ms 3 Mar 2020 867th GolfingSuccess 🇬🇷 883 48 16ms 17 Nov 2020 867th urojony 🇵🇱 883 48 19ms 26 Dec 2020 867th btjones0 883 48 17ms 30 Dec 2020 867th Indivicivet 883 48 15ms 22 Mar 2021 867th NewDefectus 🇮🇱 883 48 15ms 27 May 2021 867th Bubbler-4 883 48 9ms 16 Nov 2021 867th KatieLG 🇬🇧 883 48 16ms 2 Jun 2022 867th k3w1k0d3r 883 48 9ms 29 Jun 2022 867th FlorianCassayre 🇫🇷 883 48 15ms 6 Mar 2023 867th quimey 883 48 16ms 15 Jun 2023 867th Andriamanitra 🇫🇮 883 48 15ms 10 Jul 2023 867th stefangimmillaro 883 48 9ms 18 Jul 2023 First Prev 801–880 of 4,761 Next Last