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 240th lynn 939 49 1,221ms 27 May 2021 240th JayXon 🇺🇸 939 49 1,223ms 23 Aug 2021 240th Lydxn 🇨🇦 939 49 1,253ms 23 Aug 2021 244th primo-ppcg 🇹🇭 938 45 1ms 2 May 2020 244th Lydxn 🇨🇦 938 45 71ms 21 Mar 2023 244th Steffan153 🇫🇮 938 45 72ms 21 Mar 2023 244th JayXon 🇺🇸 938 45 73ms 21 Mar 2023 244th GrayJoKing 🇦🇺 938 45 74ms 21 Mar 2023 244th sean-niemann 🇺🇸 938 45 69ms 18 Apr 2025 250th masterada 938 85 271ms 26 Mar 2021 250th Lydxn 🇨🇦 938 85 266ms 10 Feb 2022 252nd primo-ppcg 🇹🇭 937 29 32ms 1 Apr 2019 253rd primo-ppcg 🇹🇭 937 50 115ms 1 Apr 2019 253rd jslip 937 50 114ms 2 Apr 2019 253rd SirHaswell 937 50 120ms 13 Jun 2019 253rd Attero 🇸🇪 937 50 116ms 31 Mar 2020 253rd SirBogman 🇺🇸 937 50 122ms 14 Jun 2020 253rd aionescu 937 50 115ms 15 Aug 2020 253rd GrayJoKing 🇦🇺 937 50 116ms 6 Dec 2020 253rd sisyphus-ppcg 🇦🇺 937 50 120ms 20 Mar 2021 253rd Shanethegamer 🇺🇸 937 50 120ms 30 Jun 2021 253rd laikoni 937 50 111ms 27 Aug 2021 253rd Irratix 🇳🇱 937 50 113ms 25 Sep 2021 253rd annaproxy 937 50 124ms 7 Jan 2022 253rd janbehrens 🇩🇪 937 50 112ms 20 Jul 2022 253rd Steffan153 🇫🇮 937 50 120ms 8 Oct 2022 253rd alomiF 937 50 120ms 1 Sep 2023 253rd jared-hughes 937 50 121ms 7 Jul 2024 253rd sean-niemann 🇺🇸 937 50 120ms 7 Jan 2025 253rd DialFrost 🇸🇬 937 50 113ms 14 Feb 2025 253rd iczelia 🇩🇪 937 50 115ms 16 Oct 2025 253rd edsrzf 🇳🇿 937 50 146ms 3 hours ago 273rd sean-niemann 🇺🇸 936 76 60ms 2 Jan 2022 273rd nwellnhof 🇩🇪 936 76 64ms 3 Jan 2022 273rd Irratix 🇳🇱 936 76 76ms 3 Jan 2022 273rd primo-ppcg 🇹🇭 936 76 71ms 18 Jan 2022 273rd voytxt 🇨🇿 936 76 78ms 10 Apr 2022 273rd jared-hughes 936 76 59ms 20 Jul 2022 273rd MeWhenI 🇻🇦 936 76 53ms 6 Sep 2022 273rd DialFrost 🇸🇬 936 76 78ms 30 Jan 2023 273rd Steffan153 🇫🇮 936 76 75ms 7 Feb 2023 273rd xsot 🇸🇬 936 76 73ms 21 May 2023 273rd GrayJoKing 🇦🇺 936 76 69ms 29 Feb 2024 273rd dokutan 936 76 61ms 25 Sep 2024 273rd snyderek 🇺🇸 936 76 78ms 3 Oct 2024 273rd fuzzylojik-golf 🇺🇸 936 76 59ms 28 Jun 2025 273rd Yax42 🇫🇷 936 76 82ms 4 Oct 2025 273rd Babafaba 936 76 62ms 15 Oct 2025 273rd KasperKivimaeki 🇫🇮 936 76 76ms 15 Oct 2025 273rd inventshah 936 76 75ms 25 Oct 2025 273rd 09cf 936 76 73ms 25 days ago 292nd primo-ppcg 🇹🇭 935 36 374ms 12 Oct 2020 292nd HPWiz 🇳🇿 935 36 481ms 17 Nov 2020 292nd antimon2 🇯🇵 935 36 445ms 25 Jan 2021 292nd ovs-code 🇩🇪 935 36 498ms 24 Oct 2023 296th somebody1234 935 43 9ms 7 Dec 2018 296th dymowski 935 43 9ms 7 Jul 2019 296th KrausRaus 🇺🇸 935 43 9ms 22 Aug 2019 296th handisb 935 43 9ms 31 Aug 2019 296th dorinoltean 935 43 9ms 2 Oct 2019 296th oitio 935 43 9ms 12 Feb 2020 296th shuding 935 43 8ms 27 Apr 2020 296th taklam 935 43 9ms 20 May 2020 296th raphaelimahorn 935 43 9ms 4 Sep 2020 296th revlayle 🇺🇸 935 43 9ms 14 Sep 2020 296th PatrickStephansen 🇿🇦 935 43 9ms 15 Oct 2020 296th tpiechaczek 🇵🇱 935 43 9ms 24 Dec 2020 296th toubsen 🇩🇪 935 43 9ms 8 Jan 2021 296th omurakazuaki 🇯🇵 935 43 9ms 19 Feb 2021 296th lukasmoellerch 935 43 8ms 15 Mar 2021 296th MossGrass 🇺🇸 935 43 8ms 21 May 2021 296th wansacis 🇩🇪 935 43 9ms 28 Jul 2021 296th lynn 935 43 8ms 10 Sep 2021 296th alasdair-greenland 935 43 9ms 11 Nov 2021 296th emgordon154 935 43 9ms 23 Nov 2021 296th solmyr2000 935 43 8ms 8 Jun 2022 296th AlephSquirrel 935 43 9ms 18 Jul 2022 296th FlorianCassayre 🇫🇷 935 43 9ms 27 Sep 2022 296th BloodStormKnight 935 43 9ms 13 Oct 2022 296th LukeBridges 🇬🇧 935 43 9ms 17 Oct 2022 First Prev 241–320 of 4,762 Next Last