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 479th obarakon 913 44 8ms 9 Jan 2019 479th elisherer 🇮🇱 913 44 9ms 28 Mar 2019 479th goldenice 913 44 9ms 4 Apr 2019 479th user189032 913 44 9ms 29 May 2019 479th marcin7Cd 913 44 9ms 13 Mar 2020 479th ondras 913 44 9ms 3 May 2020 479th daisy-lau 913 44 8ms 20 May 2020 479th efgen 913 44 9ms 12 Jun 2020 479th itsh01 913 44 9ms 15 Jul 2020 479th thisishowmymindworks 🇳🇴 913 44 9ms 20 Jul 2020 479th ToriTheChicken 913 44 9ms 21 Jul 2020 479th ehouais 913 44 9ms 23 Aug 2020 479th Athe81 913 44 9ms 30 Oct 2020 479th jn-lp 🇺🇦 913 44 9ms 1 Nov 2020 479th pandapawskat 913 44 8ms 3 Dec 2020 479th boxjelly 913 44 8ms 14 Feb 2021 479th blader0x 913 44 8ms 28 Mar 2021 479th heypwesto 🇳🇿 913 44 8ms 20 Apr 2021 479th Shanethegamer 🇺🇸 913 44 8ms 22 May 2021 479th Natanaelel 🇸🇪 913 44 8ms 1 Oct 2021 479th alex-oser 🇲🇰 913 44 9ms 5 Oct 2021 479th igmcdowell 913 44 8ms 25 Nov 2021 479th shellbertt 🇨🇦 913 44 8ms 3 Dec 2021 479th ZakkkkAttackkkk 🇵🇭 913 44 9ms 17 Dec 2021 479th fitzdotlol 🇺🇸 913 44 9ms 8 Mar 2022 479th vincens2005 🇺🇸 913 44 9ms 30 Mar 2022 479th otubby 913 44 8ms 30 Mar 2022 479th NathanGabrielson 913 44 8ms 30 Mar 2022 479th inverseLorentz 🇦🇺 913 44 8ms 28 Jun 2022 479th two-bad 🇬🇧 913 44 8ms 5 Jul 2022 479th aksyristos 913 44 9ms 28 Oct 2022 479th scpchicken 🇵🇼 913 44 9ms 22 Feb 2023 479th Kesefon 913 44 9ms 25 Apr 2023 479th dteague3989 913 44 8ms 27 May 2023 479th unfinishedprogram 913 44 9ms 4 Jul 2023 479th Davr1 🇨🇿 913 44 9ms 15 Oct 2023 479th Yewzir 🇧🇪 913 44 9ms 15 Oct 2023 479th dylanarmstrong 913 44 8ms 22 Jan 2024 479th hacker112 🇸🇪 913 44 9ms 22 Jun 2024 479th piano-miles 913 44 9ms 6 Sep 2024 479th kovdmm 913 44 8ms 13 Oct 2024 479th CaedenHarper 🇨🇦 913 44 9ms 22 Oct 2024 479th XenThe 🇬🇧 913 44 9ms 7 Jun 2025 479th olleicua 🇺🇸 913 44 9ms 13 Aug 2025 479th LordSir101 913 44 9ms 18 Aug 2025 526th GrayJoKing 🇦🇺 913 53 99ms 18 Oct 2022 527th Lydxn 🇨🇦 912 55 4ms 16 Jul 2023 528th m-tkach 🇺🇦 911 78 55ms 24 Oct 2022 528th NDR0216 🇹🇼 911 78 83ms 9 May 2024 528th yeminghan2021 911 78 80ms 2 Feb 2025 528th qwertyuiop3 🇷🇺 911 78 83ms 2 Jun 2025 532nd lynn 909 22 50ms 26 Jul 2022 532nd SirBogman 🇺🇸 909 22 42ms 18 Sep 2022 532nd pardouin 🇫🇷 909 22 41ms 24 Oct 2024 532nd saito-ta 🇯🇵 909 22 41ms 28 Aug 2025 536th retrohun 909 31 2ms 30 Apr 2019 536th scpchicken 🇵🇼 909 31 2ms 18 Jun 2023 536th fuzzylojik-golf 🇺🇸 909 31 3ms 22 May 2025 539th UnderKoen 🇳🇱 909 72 2ms 16 Jun 2025 540th DialFrost 🇸🇬 908 45 3,506ms 23 Oct 2024 540th dokutan 908 45 3,579ms 23 Oct 2024 540th sean-niemann 🇺🇸 908 45 3,865ms 23 Oct 2024 540th MeWhenI 🇻🇦 908 45 3,663ms 24 Oct 2024 540th pardouin 🇫🇷 908 45 4,505ms 24 Oct 2024 545th Steffan153 🇫🇮 908 53 4ms 18 Feb 2023 545th xsot 🇸🇬 908 53 4ms 11 Feb 2024 545th sean-niemann 🇺🇸 908 53 4ms 25 Mar 2025 548th Bubbler-4 907 24 2ms 10 Jan 2022 548th GrayJoKing 🇦🇺 907 24 2ms 2 Feb 2022 548th lynn 907 24 2ms 27 May 2022 548th bstrat 907 24 2ms 9 Oct 2024 552nd antimon2 🇯🇵 907 36 445ms 25 Jan 2021 553rd janbehrens 🇩🇪 907 69 453ms 24 Mar 2022 553rd voytxt 🇨🇿 907 69 447ms 7 Apr 2022 553rd Yewzir 🇧🇪 907 69 420ms 17 Nov 2023 556th MeWhenI 🇻🇦 906 45 87ms 12 Oct 2022 556th Steffan153 🇫🇮 906 45 79ms 19 Feb 2023 556th sean-niemann 🇺🇸 906 45 80ms 6 May 2024 559th primo-ppcg 🇹🇭 906 51 4ms 20 May 2023 560th sisyphus-ppcg 🇦🇺 905 34 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