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 880th Alessandro-Balconi 🇮🇹 875 39 72ms 26 Dec 2022 882nd Yewzir 🇧🇪 875 55 3ms 29 Mar 2024 883rd somebody1234 874 26 267ms 5 Dec 2018 883rd AlexDaniel 🇪🇪 874 26 221ms 5 Apr 2020 885th 4hg 🇺🇸 874 45 63ms 13 Sep 2023 885th chunes3 🇺🇸 874 45 71ms 13 Sep 2023 885th Bubbler-4 874 45 71ms 13 Sep 2023 885th Steffan153 🇫🇮 874 45 70ms 13 Sep 2023 885th GolfingSuccess 🇬🇷 874 45 72ms 28 Sep 2023 885th Lydxn 🇨🇦 874 45 71ms 28 Sep 2023 885th Yewzir 🇧🇪 874 45 71ms 5 Mar 2024 892nd nwellnhof 🇩🇪 874 88 266ms 3 Sep 2020 892nd MeWhenI 🇻🇦 874 88 274ms 9 Feb 2023 892nd sean-niemann 🇺🇸 874 88 267ms 17 Jun 2023 892nd fuzzylojik-golf 🇺🇸 874 88 267ms 15 Jul 2025 896th oparisblue 873 46 9ms 24 Mar 2019 896th mrxz 🇳🇱 873 46 8ms 23 Jun 2019 896th alexkunin 873 46 8ms 3 Jul 2019 896th EFHIII 873 46 9ms 16 Aug 2020 896th yzhs 🇩🇪 873 46 9ms 20 Aug 2020 896th hyvyys 873 46 8ms 18 Sep 2020 896th bastienvoirin 🇫🇷 873 46 9ms 28 Nov 2020 896th Re-Adventures 🇮🇳 873 46 9ms 25 Mar 2021 896th PGPereira 873 46 9ms 27 Mar 2021 896th con-cs 873 46 9ms 18 Oct 2021 896th ledietz 873 46 9ms 16 Feb 2022 896th zakariamouhid 873 46 8ms 20 May 2023 896th adriweb 🇫🇷 873 46 9ms 28 Aug 2023 896th stellartux 873 46 8ms 27 Dec 2023 896th itserasmus 873 46 9ms 26 Jan 2024 896th HumanoidCPU 873 46 9ms 19 Feb 2024 896th rollershutter 873 46 9ms 4 Jul 2024 896th deancureton 873 46 8ms 29 Dec 2024 896th duckyluuk 🇳🇱 873 46 9ms 22 Jan 2025 896th acer-xq 873 46 8ms 4 Feb 2025 896th BalaM314 873 46 9ms 8 Feb 2025 896th Laellekoenig 873 46 9ms 22 Oct 2025 918th Shanethegamer 🇺🇸 873 57 6ms 9 Jan 2024 918th edsrzf 🇳🇿 873 57 10ms 17 Dec 2024 920th Yewzir 🇧🇪 872 43 2ms 19 Nov 2025 921st MeWhenI 🇻🇦 872 53 4ms 22 May 2023 922nd MeWhenI 🇻🇦 871 44 129ms 3 Aug 2024 922nd GrayJoKing 🇦🇺 871 44 127ms 3 Aug 2024 922nd DialFrost 🇸🇬 871 44 119ms 8 Aug 2024 922nd rucin93 🇵🇱 871 44 122ms 9 Aug 2024 926th retrohun 871 60 2ms 11 May 2019 926th marcin7Cd 871 60 2ms 17 May 2020 926th nexaitch 871 60 1ms 10 Jul 2020 926th lukasmoellerch 871 60 2ms 15 Mar 2021 926th djeedjay 🇳🇱 871 60 2ms 6 Sep 2021 926th Bubbler-4 871 60 2ms 16 Nov 2021 926th emgordon154 871 60 2ms 2 Dec 2021 926th ZakkkkAttackkkk 🇵🇭 871 60 2ms 17 Dec 2021 926th GolfingSuccess 🇬🇷 871 60 2ms 16 Jan 2022 926th nai62 871 60 2ms 28 Aug 2022 926th m-tkach 🇺🇦 871 60 1ms 24 Oct 2022 926th speles 🇺🇦 871 60 2ms 29 Oct 2023 926th elgan65536 871 60 5ms 11 Nov 2023 926th klixel 🇨🇦 871 60 2ms 17 Nov 2023 926th NDR0216 🇹🇼 871 60 2ms 9 May 2024 926th mttcrn 871 60 2ms 25 Mar 2025 926th Shanethegamer 🇺🇸 871 60 2ms 28 May 2025 926th csharpython 871 60 2ms 23 Jul 2025 944th GolfingSuccess 🇬🇷 870 23 38ms 14 Aug 2022 944th primo-ppcg 🇹🇭 870 23 56ms 15 Feb 2023 946th stefangimmillaro 870 47 3,774ms 25 Oct 2024 946th ScottHamper 870 47 3,800ms 25 Oct 2024 946th janlelis 870 47 3,487ms 25 Apr 2025 949th emgordon154 869 72 444ms 26 May 2025 949th Yax42 🇫🇷 869 72 481ms 15 Oct 2025 951st voytxt 🇨🇿 868 38 3ms 11 Aug 2024 951st Shanethegamer 🇺🇸 868 38 3ms 13 Aug 2024 951st dokutan 868 38 4ms 25 Sep 2024 954th orthoplex 🇨🇽 867 37 35ms 30 Mar 2022 955th Lydxn 🇨🇦 867 43 5ms 4 Jan 2022 955th dvargas46 🇺🇸 867 43 29ms 28 Feb 2023 957th masashimachida 867 51 4ms 6 Aug 2020 957th KrausRaus 🇺🇸 867 51 4ms 12 Jan 2021 957th Meri-Dax 867 51 4ms 30 May 2022 957th Yewzir 🇧🇪 867 51 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