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 554th voytxt 🇨🇿 912 62 323ms 7 Apr 2022 554th logicolor 912 62 320ms 27 Apr 2022 554th Gaddy 🇫🇷 912 62 321ms 2 May 2022 554th Romain-1 🇫🇷 912 62 320ms 3 May 2022 554th AdrienHache 🇫🇷 912 62 361ms 6 Jun 2023 554th jwonagel 912 62 318ms 25 Sep 2023 554th Babafaba 912 62 360ms 15 Oct 2025 568th m-tkach 🇺🇦 912 78 55ms 24 Oct 2022 568th NDR0216 🇹🇼 912 78 83ms 9 May 2024 568th yeminghan2021 912 78 80ms 2 Feb 2025 568th qwertyuiop3 🇷🇺 912 78 83ms 2 Jun 2025 572nd DialFrost 🇸🇬 911 45 3,506ms 23 Oct 2024 572nd dokutan 911 45 3,579ms 23 Oct 2024 572nd sean-niemann 🇺🇸 911 45 3,865ms 23 Oct 2024 572nd MeWhenI 🇻🇦 911 45 3,663ms 24 Oct 2024 572nd pardouin 🇫🇷 911 45 4,505ms 24 Oct 2024 577th Steffan153 🇫🇮 911 53 4ms 18 Feb 2023 577th xsot 🇸🇬 911 53 4ms 11 Feb 2024 577th sean-niemann 🇺🇸 911 53 4ms 25 Mar 2025 580th dokutan 910 37 379ms 18 Mar 2025 581st lyphyser 910 45 52ms 8 Jan 2025 582nd UnderKoen 🇳🇱 910 72 2ms 16 Jun 2025 583rd Lydxn 🇨🇦 909 56 9ms 15 Nov 2021 583rd lynn 909 56 9ms 16 Nov 2021 583rd GrayJoKing 🇦🇺 909 56 9ms 16 Nov 2021 583rd JayXon 🇺🇸 909 56 10ms 19 Nov 2021 583rd annaproxy 909 56 9ms 31 Dec 2021 583rd IanUtley 909 56 10ms 19 Jun 2024 583rd ovs-code 🇩🇪 909 56 9ms 29 Jun 2024 590th sisyphus-ppcg 🇦🇺 908 34 912ms 26 Mar 2021 590th dokutan 908 34 917ms 25 Sep 2024 592nd MeWhenI 🇻🇦 908 45 87ms 12 Oct 2022 592nd Steffan153 🇫🇮 908 45 79ms 19 Feb 2023 592nd sean-niemann 🇺🇸 908 45 80ms 6 May 2024 595th primo-ppcg 🇹🇭 908 51 4ms 20 May 2023 596th janbehrens 🇩🇪 908 69 453ms 24 Mar 2022 596th voytxt 🇨🇿 908 69 447ms 7 Apr 2022 598th dokutan 907 40 640ms 15 Jul 2025 599th kg583 🇺🇸 907 44 395ms 15 Jan 2024 599th ovs-code 🇩🇪 907 44 371ms 16 Jan 2024 599th Steffan153 🇫🇮 907 44 380ms 16 Jan 2024 599th DialFrost 🇸🇬 907 44 391ms 16 Jan 2024 599th sean-niemann 🇺🇸 907 44 329ms 17 Jan 2024 599th GrayJoKing 🇦🇺 907 44 394ms 18 Jan 2024 599th rucin93 🇵🇱 907 44 371ms 21 Jan 2024 599th pardouin 🇫🇷 907 44 396ms 23 Jun 2024 599th CornerMercury 🇬🇧 907 44 343ms 13 Oct 2025 608th 2bular 906 30 32ms 7 Nov 2025 609th stefangimmillaro 906 88 276ms 4 Aug 2023 609th Steffan153 🇫🇮 906 88 281ms 3 Aug 2024 609th sean-niemann 🇺🇸 906 88 267ms 25 Mar 2025 612th Shanethegamer 🇺🇸 905 61 41ms 13 Feb 2025 612th edsrzf 🇳🇿 905 61 41ms 19 Aug 2025 614th canissimia 🇦🇶 905 179 1ms 11 Sep 2021 615th emplv 🇱🇻 904 49 4ms 15 Apr 2021 615th janbehrens 🇩🇪 904 49 4ms 22 May 2021 615th JayXon 🇺🇸 904 49 4ms 26 Aug 2021 615th rucin93 🇵🇱 904 49 5ms 3 Dec 2021 615th GrayJoKing 🇦🇺 904 49 5ms 9 Feb 2022 615th voytxt 🇨🇿 904 49 5ms 16 May 2022 615th MeWhenI 🇻🇦 904 49 4ms 28 May 2023 615th stefangimmillaro 904 49 6ms 22 Aug 2023 615th Argeento 🇵🇱 904 49 4ms 25 Aug 2023 615th DialFrost 🇸🇬 904 49 4ms 8 Nov 2023 615th Shanethegamer 🇺🇸 904 49 4ms 9 Jan 2024 626th tjtnorton 902 47 15ms 28 Mar 2019 626th daedals 902 47 20ms 21 Apr 2019 626th handisb 902 47 15ms 5 Sep 2019 626th andersk 🇺🇸 902 47 16ms 20 Mar 2020 626th Attero 🇸🇪 902 47 10ms 9 May 2020 626th neihousaigaai 902 47 15ms 8 May 2021 626th Waffle3z 902 47 16ms 14 Jul 2021 626th janbehrens 🇩🇪 902 47 15ms 21 Oct 2021 626th annaproxy 902 47 15ms 13 Dec 2021 626th pxeger 🇬🇧 902 47 16ms 16 Feb 2022 626th sisyphus-ppcg 🇦🇺 902 47 15ms 19 Feb 2022 626th shellbertt 🇨🇦 902 47 16ms 2 May 2022 626th mrnomm 902 47 15ms 24 Aug 2022 626th jumelet 🇳🇱 902 47 18ms 23 Dec 2022 626th thatbirdguythatuknownot 902 47 19ms 3 Jan 2023 First Prev 561–640 of 4,762 Next Last