The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Leap Years in C# 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 1st Lydxn 🇨🇦 1,000 57 367ms 9 Feb 2022 1st JayXon 🇺🇸 1,000 57 322ms 9 Feb 2022 3rd btnlq 983 58 322ms 9 Feb 2022 3rd Yax42 🇫🇷 983 58 351ms 31 May 2025 5th lynn 966 59 312ms 21 Nov 2021 5th primo-ppcg 🇹🇭 966 59 311ms 21 Nov 2021 5th stefangimmillaro 966 59 314ms 4 Aug 2023 5th sean-niemann 🇺🇸 966 59 320ms 3 Aug 2024 9th Attero 🇸🇪 934 61 311ms 21 Nov 2021 9th nwellnhof 🇩🇪 934 61 311ms 21 Nov 2021 9th tomtheisen 🇺🇸 934 61 315ms 21 Nov 2021 9th MeWhenI 🇻🇦 934 61 322ms 10 Oct 2022 9th Steffan153 🇫🇮 934 61 320ms 1 Jan 2023 9th DialFrost 🇸🇬 934 61 381ms 8 Nov 2023 9th namelessiw 934 61 361ms 11 Jul 2024 9th dokutan 934 61 343ms 25 Sep 2024 9th pardouin 🇫🇷 934 61 348ms 26 Sep 2024 9th b-illy 🇬🇧 934 61 320ms 21 Jan 2025 9th fuzzylojik-golf 🇺🇸 934 61 374ms 28 Jun 2025 9th edsrzf 🇳🇿 934 61 413ms 15 hours ago 21st initram 919 62 320ms 21 Nov 2021 21st janbehrens 🇩🇪 919 62 321ms 21 Nov 2021 21st jmhowl 919 62 321ms 21 Nov 2021 21st ScottHamper 919 62 314ms 21 Nov 2021 21st Irratix 🇳🇱 919 62 322ms 13 Dec 2021 21st simon-biber 919 62 318ms 7 Feb 2022 21st annaproxy 919 62 316ms 15 Mar 2022 21st voytxt 🇨🇿 919 62 323ms 7 Apr 2022 21st logicolor 919 62 320ms 27 Apr 2022 21st Gaddy 🇫🇷 919 62 321ms 2 May 2022 21st Romain-1 🇫🇷 919 62 320ms 3 May 2022 21st AdrienHache 🇫🇷 919 62 361ms 6 Jun 2023 21st jwonagel 919 62 318ms 25 Sep 2023 21st Babafaba 919 62 360ms 15 Oct 2025 35th billings7 🇬🇧 905 63 320ms 21 Nov 2021 35th ChristophHornung 905 63 315ms 21 Nov 2021 35th KatieLG 🇬🇧 905 63 347ms 17 Oct 2022 38th Shanethegamer 🇺🇸 891 64 315ms 21 Nov 2021 38th daniel-skalik 🇨🇿 891 64 321ms 21 Nov 2021 38th fleischa 891 64 313ms 21 Nov 2021 38th Kloppermand 🇩🇰 891 64 321ms 21 Nov 2021 38th p-vf 🇨🇭 891 64 317ms 21 Nov 2021 38th raphaelimahorn 891 64 313ms 21 Nov 2021 38th revlayle 🇺🇸 891 64 313ms 21 Nov 2021 38th roavin 891 64 315ms 5 Jul 2022 38th dteague3989 891 64 327ms 26 May 2023 38th Decrare 891 64 358ms 12 Sep 2025 38th Andrey2001 891 64 378ms 25 days ago 49th AdrialaD 877 65 315ms 21 Nov 2021 49th aliakseikalosha 877 65 305ms 21 Nov 2021 49th Dersei 877 65 310ms 21 Nov 2021 49th eldritchconundrum 877 65 320ms 21 Nov 2021 49th Meowsan91 🇨🇿 877 65 311ms 21 Nov 2021 49th petroselo 877 65 311ms 21 Nov 2021 49th najs91 877 65 310ms 23 Nov 2021 49th Seanharrs 877 65 465ms 3 Dec 2021 49th FrederikHutfless 🇩🇪 877 65 318ms 12 Jan 2023 49th Matgc04 877 65 327ms 20 May 2023 49th Yewzir 🇧🇪 877 65 317ms 7 Feb 2024 49th HumanoidCPU 877 65 323ms 19 Feb 2024 49th albanian-laundromat 877 65 363ms 28 Aug 2025 49th Adix-null 🇱🇹 877 65 349ms 9 Nov 2025 63rd Alikont 864 66 310ms 21 Nov 2021 63rd hklemp 🇩🇪 864 66 330ms 21 Nov 2021 63rd Jeffreyvde 864 66 320ms 21 Nov 2021 63rd Rens-br 864 66 311ms 21 Nov 2021 63rd Rhexis 864 66 301ms 21 Nov 2021 63rd KrausRaus 🇺🇸 864 66 319ms 15 Dec 2021 63rd hamhub7 864 66 321ms 3 Aug 2022 63rd Betuaredead 864 66 309ms 4 Jan 2023 63rd msbranicky 864 66 313ms 6 Jul 2023 63rd josephdwalker 864 66 321ms 14 Nov 2023 63rd JDiLenarda 🇫🇷 864 66 320ms 14 Nov 2023 63rd ElysiaVesper 864 66 316ms 15 Nov 2023 63rd codewrite 🇬🇧 864 66 363ms 9 Jul 2025 76th DonForse 851 67 327ms 21 Nov 2021 76th thisishowmymindworks 🇳🇴 851 67 316ms 21 Nov 2021 76th ToriTheChicken 851 67 323ms 21 Nov 2021 76th postie77 851 67 310ms 17 Nov 2022 76th astdefu 851 67 321ms 10 Dec 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