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 chars. 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 Chars Time Submitted 239th SirHaswell 936 50 120ms 13 Jun 2019 239th Attero 🇸🇪 936 50 116ms 31 Mar 2020 239th SirBogman 🇺🇸 936 50 122ms 14 Jun 2020 239th aionescu 936 50 115ms 15 Aug 2020 239th GrayJoKing 🇦🇺 936 50 116ms 6 Dec 2020 239th sisyphus-ppcg 🇦🇺 936 50 120ms 20 Mar 2021 239th Shanethegamer 🇺🇸 936 50 120ms 30 Jun 2021 239th laikoni 936 50 111ms 27 Aug 2021 239th Irratix 🇳🇱 936 50 113ms 25 Sep 2021 239th annaproxy 936 50 124ms 7 Jan 2022 239th janbehrens 🇩🇪 936 50 112ms 20 Jul 2022 239th Steffan153 🇫🇮 936 50 120ms 8 Oct 2022 239th alomiF 936 50 120ms 1 Sep 2023 239th jared-hughes 936 50 121ms 7 Jul 2024 239th sean-niemann 🇺🇸 936 50 120ms 7 Jan 2025 239th DialFrost 🇸🇬 936 50 113ms 14 Feb 2025 239th iczelia 🇩🇪 936 50 115ms 16 Oct 2025 239th edsrzf 🇳🇿 936 50 146ms 5 mins ago 259th sean-niemann 🇺🇸 935 41 124ms 3 Aug 2024 259th JayXon 🇺🇸 935 41 125ms 4 Aug 2024 259th Lydxn 🇨🇦 935 41 122ms 6 Aug 2024 259th Steffan153 🇫🇮 935 41 123ms 8 Aug 2024 259th lukegustafson 🇺🇸 935 41 123ms 11 Oct 2024 264th sean-niemann 🇺🇸 935 76 60ms 2 Jan 2022 264th nwellnhof 🇩🇪 935 76 64ms 3 Jan 2022 264th Irratix 🇳🇱 935 76 76ms 3 Jan 2022 264th primo-ppcg 🇹🇭 935 76 71ms 18 Jan 2022 264th voytxt 🇨🇿 935 76 78ms 10 Apr 2022 264th jared-hughes 935 76 59ms 20 Jul 2022 264th MeWhenI 🇻🇦 935 76 53ms 6 Sep 2022 264th DialFrost 🇸🇬 935 76 78ms 30 Jan 2023 264th Steffan153 🇫🇮 935 76 75ms 7 Feb 2023 264th xsot 🇸🇬 935 76 73ms 21 May 2023 264th GrayJoKing 🇦🇺 935 76 69ms 29 Feb 2024 264th dokutan 935 76 61ms 25 Sep 2024 264th snyderek 🇺🇸 935 76 78ms 3 Oct 2024 264th fuzzylojik-golf 🇺🇸 935 76 59ms 28 Jun 2025 264th Yax42 🇫🇷 935 76 82ms 4 Oct 2025 264th Babafaba 935 76 62ms 15 Oct 2025 264th KasperKivimaeki 🇫🇮 935 76 76ms 15 Oct 2025 264th inventshah 935 76 75ms 25 Oct 2025 264th 09cf 935 76 73ms 25 days ago 283rd somebody1234 934 43 9ms 7 Dec 2018 283rd dymowski 934 43 9ms 7 Jul 2019 283rd KrausRaus 🇺🇸 934 43 9ms 22 Aug 2019 283rd handisb 934 43 9ms 31 Aug 2019 283rd dorinoltean 934 43 9ms 2 Oct 2019 283rd oitio 934 43 9ms 12 Feb 2020 283rd shuding 934 43 8ms 27 Apr 2020 283rd taklam 934 43 9ms 20 May 2020 283rd raphaelimahorn 934 43 9ms 4 Sep 2020 283rd revlayle 🇺🇸 934 43 9ms 14 Sep 2020 283rd PatrickStephansen 🇿🇦 934 43 9ms 15 Oct 2020 283rd tpiechaczek 🇵🇱 934 43 9ms 24 Dec 2020 283rd toubsen 🇩🇪 934 43 9ms 8 Jan 2021 283rd omurakazuaki 🇯🇵 934 43 9ms 19 Feb 2021 283rd lukasmoellerch 934 43 8ms 15 Mar 2021 283rd MossGrass 🇺🇸 934 43 8ms 21 May 2021 283rd wansacis 🇩🇪 934 43 9ms 28 Jul 2021 283rd lynn 934 43 8ms 10 Sep 2021 283rd alasdair-greenland 934 43 9ms 11 Nov 2021 283rd emgordon154 934 43 9ms 23 Nov 2021 283rd solmyr2000 934 43 8ms 8 Jun 2022 283rd AlephSquirrel 934 43 9ms 18 Jul 2022 283rd FlorianCassayre 🇫🇷 934 43 9ms 27 Sep 2022 283rd BloodStormKnight 934 43 9ms 13 Oct 2022 283rd LukeBridges 🇬🇧 934 43 9ms 17 Oct 2022 283rd astonm 934 43 9ms 17 Oct 2022 283rd Maznek 934 43 9ms 6 Jun 2023 283rd jbt 934 43 8ms 26 Dec 2023 283rd wlaud9 934 43 8ms 8 Feb 2024 283rd weliveinhell 🇭🇹 934 43 8ms 23 Jul 2024 283rd edsrzf 🇳🇿 934 43 9ms 14 Sep 2024 283rd acollett89 934 43 9ms 12 Jun 2025 315th HPWiz 🇳🇿 934 56 581ms 24 Nov 2022 315th KasperKivimaeki 🇫🇮 934 56 574ms 17 Dec 2024 315th DialFrost 🇸🇬 934 56 564ms 17 Dec 2024 318th primo-ppcg 🇹🇭 933 35 361ms 22 Dec 2018 318th HPWiz 🇳🇿 933 35 517ms 17 Nov 2020 318th sean-niemann 🇺🇸 933 35 495ms 30 Sep 2022 First Prev 241–320 of 4,740 Next Last