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 627th thatbirdguythatuknownot 902 47 19ms 3 Jan 2023 627th MichalMarsalek 🇨🇿 902 47 10ms 23 Feb 2023 627th AlexanderFair 902 47 16ms 15 Jun 2023 627th inventshah 902 47 20ms 18 Jul 2023 627th ListeriaM 902 47 18ms 24 Aug 2023 627th bizy-coder 902 47 16ms 2 Feb 2024 627th BREMAUCY 🇫🇷 902 47 20ms 25 Mar 2024 627th Bulmenisaurus 902 47 24ms 4 Aug 2024 627th voytxt 🇨🇿 902 47 15ms 20 Sep 2024 627th dokutan 902 47 10ms 25 Sep 2024 627th lifthrasiir 🇰🇷 902 47 15ms 20 Nov 2024 627th plcc0 902 47 9ms 6 Mar 2025 627th jipsong 🇩🇪 902 47 9ms 1 Apr 2025 627th KasperKivimaeki 🇫🇮 902 47 17ms 14 May 2025 627th keelimeguy 🇺🇸 902 47 19ms 16 May 2025 627th Flekay 🇩🇪 902 47 20ms 9 Aug 2025 627th janlelis 902 47 16ms 14 Aug 2025 627th snoozingnewt 🇨🇦 902 47 16ms 26 Sep 2025 627th blaztoma 🇱🇹 902 47 21ms 30 Sep 2025 627th Emutis 🇱🇹 902 47 19ms 25 Oct 2025 627th CommandLeo 🇮🇹 902 47 18ms 21 days ago 627th Lv0Sys 🇵🇱 902 47 16ms 18 days ago 663rd Steffan153 🇫🇮 902 51 1,233ms 1 Jan 2023 663rd neel11235813 902 51 1,279ms 4 Jan 2023 663rd MeWhenI 🇻🇦 902 51 1,256ms 8 Jun 2023 663rd dokutan 902 51 1,267ms 14 Oct 2024 663rd DialFrost 🇸🇬 902 51 1,367ms 9 Mar 2025 663rd sean-niemann 🇺🇸 902 51 1,315ms 18 Apr 2025 663rd fuzzylojik-golf 🇺🇸 902 51 1,301ms 2 Sep 2025 670th Attero 🇸🇪 902 58 2ms 12 Mar 2020 670th filharmonista 902 58 2ms 13 Mar 2020 670th cywong-amino 🇭🇰 902 58 1ms 30 May 2020 670th nwellnhof 🇩🇪 902 58 2ms 4 Oct 2020 670th primo-ppcg 🇹🇭 902 58 2ms 5 Oct 2020 670th Irratix 🇳🇱 902 58 2ms 9 Oct 2020 670th madex 🇩🇪 902 58 2ms 23 Mar 2021 670th NewDefectus 🇮🇱 902 58 2ms 27 May 2021 670th tsunderu 🇯🇵 902 58 1ms 2 Sep 2021 670th sean-niemann 🇺🇸 902 58 1ms 5 Jan 2022 670th GrayJoKing 🇦🇺 902 58 2ms 9 Feb 2022 670th voytxt 🇨🇿 902 58 2ms 7 Apr 2022 670th emplv 🇱🇻 902 58 1ms 28 Apr 2022 670th prplz 🇦🇺 902 58 2ms 22 May 2022 670th jared-hughes 902 58 2ms 24 Jun 2022 670th MeWhenI 🇻🇦 902 58 1ms 6 Sep 2022 670th Steffan153 🇫🇮 902 58 1ms 26 Dec 2022 670th inventshah 902 58 2ms 26 Jan 2023 670th ovs-code 🇩🇪 902 58 2ms 5 Feb 2023 670th xsot 🇸🇬 902 58 1ms 19 Mar 2023 670th rucin93 🇵🇱 902 58 2ms 21 Jun 2023 670th stefangimmillaro 902 58 2ms 4 Aug 2023 670th ListeriaM 902 58 2ms 24 Aug 2023 670th JohandeRuiter 🇳🇱 902 58 2ms 25 Oct 2023 670th dokutan 902 58 2ms 25 Sep 2024 670th FlyingPenguin223 902 58 1ms 10 Feb 2025 670th kdx2a 902 58 2ms 11 Feb 2025 670th Mukundan314 902 58 1ms 26 Apr 2025 670th fuzzylojik-golf 🇺🇸 902 58 2ms 28 Jun 2025 670th Yax42 🇫🇷 902 58 2ms 9 Oct 2025 670th ApoChagi 902 58 1ms 14 Oct 2025 670th Babafaba 902 58 1ms 15 Oct 2025 670th 09cf 902 58 2ms 25 days ago 703rd sean-niemann 🇺🇸 901 38 68ms 14 Sep 2023 703rd blaztoma 🇱🇹 901 38 82ms 2 Nov 2025 705th arjanadriaanse 🇳🇱 901 52 121ms 1 Jan 2022 706th retrohun 900 46 1ms 16 Jun 2024 707th Shanethegamer 🇺🇸 900 79 72ms 12 Jan 2022 707th Yewzir 🇧🇪 900 79 79ms 9 Dec 2023 707th oceko 900 79 62ms 19 Feb 2024 707th CaedenHarper 🇨🇦 900 79 62ms 1 Feb 2025 707th yanjs 900 79 487ms 10 Jul 2025 707th AutumnWind75 900 79 459ms 11 days ago 713th MeWhenI 🇻🇦 899 54 96ms 15 Oct 2022 713th Yax42 🇫🇷 899 54 96ms 5 Oct 2025 715th AlephSquirrel 899 60 5ms 13 Mar 2023 715th Lydxn 🇨🇦 899 60 15ms 31 Jan 2025 715th edsrzf 🇳🇿 899 60 14ms 6 days ago 718th JayXon 🇺🇸 899 69 25ms 17 Apr 2022 719th billings7 🇬🇧 898 63 320ms 21 Nov 2021 719th ChristophHornung 898 63 315ms 21 Nov 2021 First Prev 641–720 of 4,762 Next Last