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 801st YoranDS 889 80 72ms 29 May 2023 801st Walter225 889 80 58ms 10 Jul 2023 801st Mandrzejy 🇵🇱 889 80 60ms 22 Feb 2024 801st keelimeguy 🇺🇸 889 80 57ms 16 May 2025 801st GolfingSuccess 🇬🇷 889 80 61ms 2 Sep 2025 801st Andrey2001 889 80 80ms 25 days ago 807th MWI-polygolf 888 46 78ms 18 Feb 2023 807th steffan-polygolf 888 46 77ms 19 Feb 2023 807th DialFrost 🇸🇬 888 46 89ms 8 Nov 2023 807th dokutan 888 46 77ms 25 Sep 2024 811th GrayJoKing 🇦🇺 887 45 121ms 9 Feb 2022 811th sean-niemann 🇺🇸 887 45 119ms 12 Apr 2022 811th MeWhenI 🇻🇦 887 45 122ms 10 Oct 2022 811th Steffan153 🇫🇮 887 45 123ms 1 Jan 2023 811th MWI-polygolf 887 45 122ms 18 Feb 2023 811th steffan-polygolf 887 45 120ms 19 Feb 2023 811th DialFrost 🇸🇬 887 45 121ms 8 Nov 2023 811th AlephSquirrel 887 45 360ms 21 Jan 2024 811th m-tkach 🇺🇦 887 45 354ms 5 Feb 2024 811th neel11235813 887 45 355ms 2 Mar 2024 811th MeWhenI 🇻🇦 887 45 396ms 13 Jul 2024 811th dokutan 887 45 121ms 25 Sep 2024 811th dokutan 887 45 431ms 25 Sep 2024 811th CaedenHarper 🇨🇦 887 45 392ms 24 Jul 2025 811th Babafaba 887 45 422ms 24 days ago 826th andersk 🇺🇸 887 59 2ms 20 Mar 2020 826th uw4 887 59 1ms 29 Aug 2020 826th janbehrens 🇩🇪 887 59 2ms 22 May 2021 826th lynn 887 59 2ms 2 Oct 2021 826th simon-biber 887 59 2ms 7 Feb 2022 826th LorenzoDeGaspari 887 59 2ms 20 Jun 2022 826th solmyr2000 887 59 2ms 21 Jun 2022 826th AlephSquirrel 887 59 2ms 18 Jul 2022 826th Alex-x90 🇺🇸 887 59 2ms 24 Nov 2022 826th annaproxy 887 59 2ms 8 Jan 2023 826th b10011 🇫🇮 887 59 1ms 8 Jan 2023 826th orthoplex 🇨🇽 887 59 1ms 14 Jun 2024 826th yanjs 887 59 1ms 5 Jul 2025 826th luuumine 🇫🇷 887 59 1ms 29 Oct 2025 840th janbehrens 🇩🇪 886 38 371ms 1 Nov 2021 840th MeWhenI 🇻🇦 886 38 369ms 25 Nov 2022 842nd villfa 886 50 4ms 27 May 2019 842nd UpwardProcess 886 50 4ms 30 Jul 2019 842nd ondras 886 50 4ms 3 May 2020 842nd cywong-amino 🇭🇰 886 50 4ms 20 May 2020 842nd Attero 🇸🇪 886 50 4ms 31 Aug 2020 842nd sisyphus-ppcg 🇦🇺 886 50 7ms 5 Nov 2020 842nd toubsen 🇩🇪 886 50 4ms 26 Dec 2020 842nd fuzzylojik-golf 🇺🇸 886 50 4ms 28 Jun 2025 850th CaedenHarper 🇨🇦 886 90 257ms 12 Nov 2025 851st frankgraziano 886 132 11ms 3 Nov 2025 852nd lynn 884 32 3ms 26 Mar 2021 852nd perlebach 🇨🇿 884 32 2ms 13 Aug 2021 852nd Steffan153 🇫🇮 884 32 3ms 24 Feb 2023 852nd sean-niemann 🇺🇸 884 32 2ms 13 Mar 2025 856th yanjs 884 53 119ms 3 Jul 2025 857th Steffan153 🇫🇮 884 61 15ms 22 Aug 2024 858th daniel-skalik 🇨🇿 884 64 321ms 21 Nov 2021 858th fleischa 884 64 313ms 21 Nov 2021 858th Kloppermand 🇩🇰 884 64 321ms 21 Nov 2021 858th p-vf 🇨🇭 884 64 317ms 21 Nov 2021 858th raphaelimahorn 884 64 313ms 21 Nov 2021 858th revlayle 🇺🇸 884 64 313ms 21 Nov 2021 858th roavin 884 64 315ms 5 Jul 2022 858th dteague3989 884 64 327ms 26 May 2023 858th Decrare 884 64 358ms 12 Sep 2025 858th Andrey2001 884 64 378ms 24 days ago 868th prplz 🇦🇺 883 48 15ms 19 Sep 2019 868th TFeld00 🇩🇰 883 48 9ms 3 Mar 2020 868th GolfingSuccess 🇬🇷 883 48 16ms 17 Nov 2020 868th urojony 🇵🇱 883 48 19ms 26 Dec 2020 868th btjones0 883 48 17ms 30 Dec 2020 868th Indivicivet 883 48 15ms 22 Mar 2021 868th NewDefectus 🇮🇱 883 48 15ms 27 May 2021 868th Bubbler-4 883 48 9ms 16 Nov 2021 868th KatieLG 🇬🇧 883 48 16ms 2 Jun 2022 868th k3w1k0d3r 883 48 9ms 29 Jun 2022 868th FlorianCassayre 🇫🇷 883 48 15ms 6 Mar 2023 868th quimey 883 48 16ms 15 Jun 2023 868th Andriamanitra 🇫🇮 883 48 15ms 10 Jul 2023 First Prev 801–880 of 4,762 Next Last