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 875th HumanoidCPU 877 81 63ms 19 Feb 2024 882nd JayXon 🇺🇸 876 121 1,653ms 15 Sep 2025 883rd Steffan153 🇫🇮 875 39 70ms 26 Dec 2022 883rd Alessandro-Balconi 🇮🇹 875 39 72ms 26 Dec 2022 885th Yewzir 🇧🇪 875 55 3ms 29 Mar 2024 886th somebody1234 874 26 267ms 5 Dec 2018 886th AlexDaniel 🇪🇪 874 26 221ms 5 Apr 2020 888th 4hg 🇺🇸 874 45 63ms 13 Sep 2023 888th chunes3 🇺🇸 874 45 71ms 13 Sep 2023 888th Bubbler-4 874 45 71ms 13 Sep 2023 888th Steffan153 🇫🇮 874 45 70ms 13 Sep 2023 888th GolfingSuccess 🇬🇷 874 45 72ms 28 Sep 2023 888th Lydxn 🇨🇦 874 45 71ms 28 Sep 2023 888th Yewzir 🇧🇪 874 45 71ms 5 Mar 2024 895th nwellnhof 🇩🇪 874 88 266ms 3 Sep 2020 895th MeWhenI 🇻🇦 874 88 274ms 9 Feb 2023 895th sean-niemann 🇺🇸 874 88 267ms 17 Jun 2023 895th fuzzylojik-golf 🇺🇸 874 88 267ms 15 Jul 2025 899th oparisblue 873 46 9ms 24 Mar 2019 899th mrxz 🇳🇱 873 46 8ms 23 Jun 2019 899th alexkunin 873 46 8ms 3 Jul 2019 899th EFHIII 873 46 9ms 16 Aug 2020 899th yzhs 🇩🇪 873 46 9ms 20 Aug 2020 899th hyvyys 873 46 8ms 18 Sep 2020 899th bastienvoirin 🇫🇷 873 46 9ms 28 Nov 2020 899th Re-Adventures 🇮🇳 873 46 9ms 25 Mar 2021 899th PGPereira 873 46 9ms 27 Mar 2021 899th con-cs 873 46 9ms 18 Oct 2021 899th ledietz 873 46 9ms 16 Feb 2022 899th zakariamouhid 873 46 8ms 20 May 2023 899th adriweb 🇫🇷 873 46 9ms 28 Aug 2023 899th stellartux 873 46 8ms 27 Dec 2023 899th itserasmus 873 46 9ms 26 Jan 2024 899th HumanoidCPU 873 46 9ms 19 Feb 2024 899th rollershutter 873 46 9ms 4 Jul 2024 899th deancureton 873 46 8ms 29 Dec 2024 899th duckyluuk 🇳🇱 873 46 9ms 22 Jan 2025 899th acer-xq 873 46 8ms 4 Feb 2025 899th BalaM314 873 46 9ms 8 Feb 2025 899th Laellekoenig 873 46 9ms 22 Oct 2025 921st Shanethegamer 🇺🇸 873 57 6ms 9 Jan 2024 921st edsrzf 🇳🇿 873 57 10ms 17 Dec 2024 923rd Yewzir 🇧🇪 872 43 2ms 19 Nov 2025 924th MeWhenI 🇻🇦 872 53 4ms 22 May 2023 925th MeWhenI 🇻🇦 871 44 129ms 3 Aug 2024 925th GrayJoKing 🇦🇺 871 44 127ms 3 Aug 2024 925th DialFrost 🇸🇬 871 44 119ms 8 Aug 2024 925th rucin93 🇵🇱 871 44 122ms 9 Aug 2024 929th retrohun 871 60 2ms 11 May 2019 929th marcin7Cd 871 60 2ms 17 May 2020 929th nexaitch 871 60 1ms 10 Jul 2020 929th lukasmoellerch 871 60 2ms 15 Mar 2021 929th djeedjay 🇳🇱 871 60 2ms 6 Sep 2021 929th Bubbler-4 871 60 2ms 16 Nov 2021 929th emgordon154 871 60 2ms 2 Dec 2021 929th ZakkkkAttackkkk 🇵🇭 871 60 2ms 17 Dec 2021 929th GolfingSuccess 🇬🇷 871 60 2ms 16 Jan 2022 929th nai62 871 60 2ms 28 Aug 2022 929th m-tkach 🇺🇦 871 60 1ms 24 Oct 2022 929th speles 🇺🇦 871 60 2ms 29 Oct 2023 929th elgan65536 871 60 5ms 11 Nov 2023 929th klixel 🇨🇦 871 60 2ms 17 Nov 2023 929th NDR0216 🇹🇼 871 60 2ms 9 May 2024 929th mttcrn 871 60 2ms 25 Mar 2025 929th Shanethegamer 🇺🇸 871 60 2ms 28 May 2025 929th csharpython 871 60 2ms 23 Jul 2025 947th GolfingSuccess 🇬🇷 870 23 38ms 14 Aug 2022 947th primo-ppcg 🇹🇭 870 23 56ms 15 Feb 2023 949th stefangimmillaro 870 47 3,774ms 25 Oct 2024 949th ScottHamper 870 47 3,800ms 25 Oct 2024 949th janlelis 870 47 3,487ms 25 Apr 2025 952nd emgordon154 869 72 444ms 26 May 2025 952nd Yax42 🇫🇷 869 72 481ms 15 Oct 2025 954th voytxt 🇨🇿 868 38 3ms 11 Aug 2024 954th Shanethegamer 🇺🇸 868 38 3ms 13 Aug 2024 954th dokutan 868 38 4ms 25 Sep 2024 957th orthoplex 🇨🇽 867 37 35ms 30 Mar 2022 958th Lydxn 🇨🇦 867 43 5ms 4 Jan 2022 958th dvargas46 🇺🇸 867 43 29ms 28 Feb 2023 960th masashimachida 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