The Calendar hole will go live in approximately 13 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 478th elisherer 🇮🇱 913 44 9ms 28 Mar 2019 478th goldenice 913 44 9ms 4 Apr 2019 478th user189032 913 44 9ms 29 May 2019 478th marcin7Cd 913 44 9ms 13 Mar 2020 478th ondras 913 44 9ms 3 May 2020 478th daisy-lau 913 44 8ms 20 May 2020 478th efgen 913 44 9ms 12 Jun 2020 478th itsh01 913 44 9ms 15 Jul 2020 478th thisishowmymindworks 🇳🇴 913 44 9ms 20 Jul 2020 478th ToriTheChicken 913 44 9ms 21 Jul 2020 478th ehouais 913 44 9ms 23 Aug 2020 478th Athe81 913 44 9ms 30 Oct 2020 478th jn-lp 🇺🇦 913 44 9ms 1 Nov 2020 478th pandapawskat 913 44 8ms 3 Dec 2020 478th boxjelly 913 44 8ms 14 Feb 2021 478th blader0x 913 44 8ms 28 Mar 2021 478th heypwesto 🇳🇿 913 44 8ms 20 Apr 2021 478th Shanethegamer 🇺🇸 913 44 8ms 22 May 2021 478th Natanaelel 🇸🇪 913 44 8ms 1 Oct 2021 478th alex-oser 🇲🇰 913 44 9ms 5 Oct 2021 478th igmcdowell 913 44 8ms 25 Nov 2021 478th shellbertt 🇨🇦 913 44 8ms 3 Dec 2021 478th ZakkkkAttackkkk 🇵🇭 913 44 9ms 17 Dec 2021 478th fitzdotlol 🇺🇸 913 44 9ms 8 Mar 2022 478th vincens2005 🇺🇸 913 44 9ms 30 Mar 2022 478th otubby 913 44 8ms 30 Mar 2022 478th NathanGabrielson 913 44 8ms 30 Mar 2022 478th inverseLorentz 🇦🇺 913 44 8ms 28 Jun 2022 478th two-bad 🇬🇧 913 44 8ms 5 Jul 2022 478th aksyristos 913 44 9ms 28 Oct 2022 478th scpchicken 🇵🇼 913 44 9ms 22 Feb 2023 478th Kesefon 913 44 9ms 25 Apr 2023 478th dteague3989 913 44 8ms 27 May 2023 478th unfinishedprogram 913 44 9ms 4 Jul 2023 478th Davr1 🇨🇿 913 44 9ms 15 Oct 2023 478th Yewzir 🇧🇪 913 44 9ms 15 Oct 2023 478th dylanarmstrong 913 44 8ms 22 Jan 2024 478th hacker112 🇸🇪 913 44 9ms 22 Jun 2024 478th piano-miles 913 44 9ms 6 Sep 2024 478th kovdmm 913 44 8ms 13 Oct 2024 478th CaedenHarper 🇨🇦 913 44 9ms 22 Oct 2024 478th XenThe 🇬🇧 913 44 9ms 7 Jun 2025 478th olleicua 🇺🇸 913 44 9ms 13 Aug 2025 478th LordSir101 913 44 9ms 18 Aug 2025 525th GrayJoKing 🇦🇺 913 53 99ms 18 Oct 2022 526th Lydxn 🇨🇦 912 55 4ms 16 Jul 2023 527th m-tkach 🇺🇦 911 78 55ms 24 Oct 2022 527th NDR0216 🇹🇼 911 78 83ms 9 May 2024 527th yeminghan2021 911 78 80ms 2 Feb 2025 527th qwertyuiop3 🇷🇺 911 78 83ms 2 Jun 2025 531st lynn 909 22 50ms 26 Jul 2022 531st SirBogman 🇺🇸 909 22 42ms 18 Sep 2022 531st pardouin 🇫🇷 909 22 41ms 24 Oct 2024 531st saito-ta 🇯🇵 909 22 41ms 28 Aug 2025 535th retrohun 909 31 2ms 30 Apr 2019 535th scpchicken 🇵🇼 909 31 2ms 18 Jun 2023 535th fuzzylojik-golf 🇺🇸 909 31 3ms 22 May 2025 538th UnderKoen 🇳🇱 909 72 2ms 16 Jun 2025 539th DialFrost 🇸🇬 908 45 3,506ms 23 Oct 2024 539th dokutan 908 45 3,579ms 23 Oct 2024 539th sean-niemann 🇺🇸 908 45 3,865ms 23 Oct 2024 539th MeWhenI 🇻🇦 908 45 3,663ms 24 Oct 2024 539th pardouin 🇫🇷 908 45 4,505ms 24 Oct 2024 544th Steffan153 🇫🇮 908 53 4ms 18 Feb 2023 544th xsot 🇸🇬 908 53 4ms 11 Feb 2024 544th sean-niemann 🇺🇸 908 53 4ms 25 Mar 2025 547th Bubbler-4 907 24 2ms 10 Jan 2022 547th GrayJoKing 🇦🇺 907 24 2ms 2 Feb 2022 547th lynn 907 24 2ms 27 May 2022 547th bstrat 907 24 2ms 9 Oct 2024 551st antimon2 🇯🇵 907 36 445ms 25 Jan 2021 552nd janbehrens 🇩🇪 907 69 453ms 24 Mar 2022 552nd voytxt 🇨🇿 907 69 447ms 7 Apr 2022 552nd Yewzir 🇧🇪 907 69 420ms 17 Nov 2023 555th MeWhenI 🇻🇦 906 45 87ms 12 Oct 2022 555th Steffan153 🇫🇮 906 45 79ms 19 Feb 2023 555th sean-niemann 🇺🇸 906 45 80ms 6 May 2024 558th primo-ppcg 🇹🇭 906 51 4ms 20 May 2023 559th sisyphus-ppcg 🇦🇺 905 34 912ms 26 Mar 2021 559th dokutan 905 34 917ms 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