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 608th Emutis 🇱🇹 901 47 19ms 25 Oct 2025 608th CommandLeo 🇮🇹 901 47 18ms 21 days ago 608th Lv0Sys 🇵🇱 901 47 16ms 18 days ago 644th Steffan153 🇫🇮 900 51 1,233ms 1 Jan 2023 644th neel11235813 900 51 1,279ms 4 Jan 2023 644th MeWhenI 🇻🇦 900 51 1,256ms 8 Jun 2023 644th dokutan 900 51 1,267ms 14 Oct 2024 644th DialFrost 🇸🇬 900 51 1,367ms 9 Mar 2025 644th sean-niemann 🇺🇸 900 51 1,315ms 18 Apr 2025 644th fuzzylojik-golf 🇺🇸 900 51 1,301ms 2 Sep 2025 651st arjanadriaanse 🇳🇱 900 52 121ms 1 Jan 2022 652nd DialFrost 🇸🇬 900 67 421ms 24 Sep 2025 652nd nwellnhof 🇩🇪 900 67 467ms 25 Sep 2025 652nd namelessiw 900 67 453ms 4 Oct 2025 652nd stefangimmillaro 900 67 433ms 6 Oct 2025 652nd b-illy 🇬🇧 900 67 709ms 9 Oct 2025 652nd MeWhenI 🇻🇦 900 67 496ms 7 Nov 2025 652nd dokutan 900 67 484ms 21 days ago 652nd edsrzf 🇳🇿 900 67 477ms 9 hours ago 660th Shanethegamer 🇺🇸 899 79 72ms 12 Jan 2022 660th Yewzir 🇧🇪 899 79 79ms 9 Dec 2023 660th oceko 899 79 62ms 19 Feb 2024 660th CaedenHarper 🇨🇦 899 79 62ms 1 Feb 2025 660th yanjs 899 79 487ms 10 Jul 2025 660th AutumnWind75 899 79 459ms 11 days ago 666th sean-niemann 🇺🇸 898 38 68ms 14 Sep 2023 666th blaztoma 🇱🇹 898 38 82ms 2 Nov 2025 668th retrohun 898 46 1ms 16 Jun 2024 669th AlephSquirrel 897 60 5ms 13 Mar 2023 669th Lydxn 🇨🇦 897 60 15ms 31 Jan 2025 669th edsrzf 🇳🇿 897 60 14ms 6 days ago 672nd JayXon 🇺🇸 897 69 25ms 17 Apr 2022 673rd MeWhenI 🇻🇦 896 54 96ms 15 Oct 2022 673rd Yax42 🇫🇷 896 54 96ms 5 Oct 2025 675th Attero 🇸🇪 895 61 311ms 21 Nov 2021 675th nwellnhof 🇩🇪 895 61 311ms 21 Nov 2021 675th tomtheisen 🇺🇸 895 61 315ms 21 Nov 2021 675th MeWhenI 🇻🇦 895 61 322ms 10 Oct 2022 675th Steffan153 🇫🇮 895 61 320ms 1 Jan 2023 675th DialFrost 🇸🇬 895 61 381ms 8 Nov 2023 675th namelessiw 895 61 361ms 11 Jul 2024 675th dokutan 895 61 343ms 25 Sep 2024 675th pardouin 🇫🇷 895 61 348ms 26 Sep 2024 675th b-illy 🇬🇧 895 61 320ms 21 Jan 2025 675th fuzzylojik-golf 🇺🇸 895 61 374ms 28 Jun 2025 675th edsrzf 🇳🇿 895 61 413ms 9 hours ago 687th canissimia 🇦🇶 893 83 6ms 1 Aug 2023 688th ovs-code 🇩🇪 893 89 7ms 8 Jul 2024 689th dokutan 892 43 129ms 28 Sep 2024 689th emplv 🇱🇻 892 43 128ms 29 Oct 2024 691st ANDREYDEN 892 45 9ms 12 Jan 2019 691st dee-gomma 892 45 8ms 27 Mar 2019 691st Cr3aHal0 892 45 9ms 2 Jul 2019 691st StefanTifrea 892 45 9ms 15 Jul 2020 691st Non-J 892 45 9ms 27 Sep 2020 691st ryandougc 892 45 9ms 17 Dec 2020 691st ForkKILLET 🇨🇳 892 45 9ms 18 Feb 2021 691st UBKorkut 892 45 8ms 10 Mar 2021 691st neihousaigaai 892 45 8ms 8 May 2021 691st SpareManiKatti 892 45 9ms 14 Oct 2021 691st danielb7390 892 45 8ms 9 Mar 2022 691st WebDevPT 🇵🇹 892 45 9ms 10 Mar 2022 691st CiucaRazvan 892 45 9ms 29 Jul 2022 691st SirFireball3521 892 45 9ms 1 Nov 2022 691st astdefu 892 45 8ms 10 Dec 2022 691st Betuaredead 892 45 9ms 4 Jan 2023 691st Mazn3k 892 45 9ms 15 Mar 2023 691st ejini6969 892 45 9ms 25 Mar 2023 691st raszpi 🇭🇺 892 45 9ms 2 Sep 2023 691st mulmul9 🇭🇺 892 45 9ms 7 Sep 2023 691st FruzsinaLenti 892 45 8ms 8 Sep 2023 691st junkondo-jp 892 45 9ms 6 May 2024 691st Mabeloid 🇳🇴 892 45 8ms 14 Oct 2024 691st shandriy 892 45 9ms 8 Nov 2024 691st Salutations45 892 45 8ms 12 Nov 2024 691st 823126 892 45 9ms 9 Dec 2024 691st Garklein 🇨🇦 892 45 9ms 6 Jan 2025 691st jake6192 892 45 8ms 17 May 2025 691st albanian-laundromat 892 45 9ms 1 Sep 2025 691st iczelia 🇩🇪 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