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 626th MichalMarsalek 🇨🇿 902 47 10ms 23 Feb 2023 626th AlexanderFair 902 47 16ms 15 Jun 2023 626th inventshah 902 47 20ms 18 Jul 2023 626th ListeriaM 902 47 18ms 24 Aug 2023 626th bizy-coder 902 47 16ms 2 Feb 2024 626th BREMAUCY 🇫🇷 902 47 20ms 25 Mar 2024 626th Bulmenisaurus 902 47 24ms 4 Aug 2024 626th voytxt 🇨🇿 902 47 15ms 20 Sep 2024 626th dokutan 902 47 10ms 25 Sep 2024 626th lifthrasiir 🇰🇷 902 47 15ms 20 Nov 2024 626th plcc0 902 47 9ms 6 Mar 2025 626th jipsong 🇩🇪 902 47 9ms 1 Apr 2025 626th KasperKivimaeki 🇫🇮 902 47 17ms 14 May 2025 626th keelimeguy 🇺🇸 902 47 19ms 16 May 2025 626th Flekay 🇩🇪 902 47 20ms 9 Aug 2025 626th janlelis 902 47 16ms 14 Aug 2025 626th snoozingnewt 🇨🇦 902 47 16ms 26 Sep 2025 626th blaztoma 🇱🇹 902 47 21ms 30 Sep 2025 626th Emutis 🇱🇹 902 47 19ms 25 Oct 2025 626th CommandLeo 🇮🇹 902 47 18ms 20 days ago 626th Lv0Sys 🇵🇱 902 47 16ms 18 days ago 662nd Steffan153 🇫🇮 902 51 1,233ms 1 Jan 2023 662nd neel11235813 902 51 1,279ms 4 Jan 2023 662nd MeWhenI 🇻🇦 902 51 1,256ms 8 Jun 2023 662nd dokutan 902 51 1,267ms 14 Oct 2024 662nd DialFrost 🇸🇬 902 51 1,367ms 9 Mar 2025 662nd sean-niemann 🇺🇸 902 51 1,315ms 18 Apr 2025 662nd fuzzylojik-golf 🇺🇸 902 51 1,301ms 2 Sep 2025 669th Attero 🇸🇪 902 58 2ms 12 Mar 2020 669th filharmonista 902 58 2ms 13 Mar 2020 669th cywong-amino 🇭🇰 902 58 1ms 30 May 2020 669th nwellnhof 🇩🇪 902 58 2ms 4 Oct 2020 669th primo-ppcg 🇹🇭 902 58 2ms 5 Oct 2020 669th Irratix 🇳🇱 902 58 2ms 9 Oct 2020 669th madex 🇩🇪 902 58 2ms 23 Mar 2021 669th NewDefectus 🇮🇱 902 58 2ms 27 May 2021 669th tsunderu 🇯🇵 902 58 1ms 2 Sep 2021 669th sean-niemann 🇺🇸 902 58 1ms 5 Jan 2022 669th GrayJoKing 🇦🇺 902 58 2ms 9 Feb 2022 669th voytxt 🇨🇿 902 58 2ms 7 Apr 2022 669th emplv 🇱🇻 902 58 1ms 28 Apr 2022 669th prplz 🇦🇺 902 58 2ms 22 May 2022 669th jared-hughes 902 58 2ms 24 Jun 2022 669th MeWhenI 🇻🇦 902 58 1ms 6 Sep 2022 669th Steffan153 🇫🇮 902 58 1ms 26 Dec 2022 669th inventshah 902 58 2ms 26 Jan 2023 669th ovs-code 🇩🇪 902 58 2ms 5 Feb 2023 669th xsot 🇸🇬 902 58 1ms 19 Mar 2023 669th rucin93 🇵🇱 902 58 2ms 21 Jun 2023 669th stefangimmillaro 902 58 2ms 4 Aug 2023 669th ListeriaM 902 58 2ms 24 Aug 2023 669th JohandeRuiter 🇳🇱 902 58 2ms 25 Oct 2023 669th dokutan 902 58 2ms 25 Sep 2024 669th FlyingPenguin223 902 58 1ms 10 Feb 2025 669th kdx2a 902 58 2ms 11 Feb 2025 669th Mukundan314 902 58 1ms 26 Apr 2025 669th fuzzylojik-golf 🇺🇸 902 58 2ms 28 Jun 2025 669th Yax42 🇫🇷 902 58 2ms 9 Oct 2025 669th ApoChagi 902 58 1ms 14 Oct 2025 669th Babafaba 902 58 1ms 15 Oct 2025 669th 09cf 902 58 2ms 25 days ago 702nd sean-niemann 🇺🇸 901 38 68ms 14 Sep 2023 702nd blaztoma 🇱🇹 901 38 82ms 2 Nov 2025 704th arjanadriaanse 🇳🇱 901 52 121ms 1 Jan 2022 705th retrohun 900 46 1ms 16 Jun 2024 706th Shanethegamer 🇺🇸 900 79 72ms 12 Jan 2022 706th Yewzir 🇧🇪 900 79 79ms 9 Dec 2023 706th oceko 900 79 62ms 19 Feb 2024 706th CaedenHarper 🇨🇦 900 79 62ms 1 Feb 2025 706th yanjs 900 79 487ms 10 Jul 2025 706th AutumnWind75 900 79 459ms 10 days ago 712th MeWhenI 🇻🇦 899 54 96ms 15 Oct 2022 712th Yax42 🇫🇷 899 54 96ms 5 Oct 2025 714th AlephSquirrel 899 60 5ms 13 Mar 2023 714th Lydxn 🇨🇦 899 60 15ms 31 Jan 2025 714th edsrzf 🇳🇿 899 60 14ms 6 days ago 717th JayXon 🇺🇸 899 69 25ms 17 Apr 2022 718th billings7 🇬🇧 898 63 320ms 21 Nov 2021 718th ChristophHornung 898 63 315ms 21 Nov 2021 718th KatieLG 🇬🇧 898 63 347ms 17 Oct 2022 First Prev 641–720 of 4,762 Next Last