The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Leap Years in C# in bytes. 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 Bytes Time Submitted 71st Bubblesphere 881 67 354ms 24 Dec 2024 71st CaedenHarper 🇨🇦 881 67 354ms 1 Feb 2025 71st Mikey-Beep 🇬🇧 881 67 347ms 23 Jul 2025 71st tomh1012 881 67 350ms 17 days ago 85th hklemp 🇩🇪 868 68 332ms 21 Nov 2021 85th Re-Adventures 🇮🇳 868 68 328ms 15 Feb 2022 85th malworthy 868 68 323ms 17 Oct 2023 85th michelebastione 🇮🇹 868 68 369ms 6 Aug 2025 85th snoozingnewt 🇨🇦 868 68 369ms 4 Oct 2025 90th muztanger 855 69 310ms 21 Nov 2021 90th tdkkdt 🇷🇺 855 69 330ms 21 Nov 2021 90th ericlangedijk 🇸🇮 855 69 317ms 19 Mar 2022 90th hacktick 855 69 326ms 22 Mar 2022 90th RandGuy 855 69 308ms 1 Apr 2022 90th arctouch-cristiannevianna 855 69 316ms 21 Jun 2023 96th DonForse 843 70 327ms 21 Nov 2021 96th jahakari 843 70 319ms 21 Nov 2021 96th Trickermand 843 70 319ms 21 Nov 2021 96th ChrisTheisen 843 70 322ms 12 Dec 2022 96th StronkCheese 🇺🇸 843 70 315ms 4 Feb 2023 96th TimJackMaster 843 70 317ms 16 Feb 2023 96th Sora1248 🇩🇪 843 70 322ms 19 Feb 2023 96th 1231234md5 🇨🇳 843 70 323ms 11 Dec 2023 104th Cbrt74088 831 71 319ms 21 Nov 2021 104th mandm-pt 831 71 326ms 21 Nov 2021 104th bschorno 831 71 312ms 3 Aug 2022 104th kkoenig 831 71 322ms 22 Dec 2023 108th c0d3-4-F00d 🇩🇪 819 72 317ms 21 Nov 2021 108th grabthefish 819 72 325ms 21 Nov 2021 108th shellbertt 🇨🇦 819 72 326ms 2 Dec 2021 108th hippopotam00sehead 🇨🇦 819 72 365ms 11 Sep 2024 112th afgarciam 808 73 312ms 21 Nov 2021 112th bac0id 808 73 314ms 21 Nov 2021 112th meesterturner 808 73 327ms 21 Nov 2021 112th TheMickeyMouse 808 73 334ms 21 Nov 2021 112th qpooqp 808 73 310ms 21 Nov 2021 112th gpikmddk 808 73 322ms 12 Aug 2022 118th Adelzu 797 74 316ms 21 Nov 2021 118th bdawgert 797 74 311ms 21 Nov 2021 118th MarkStockwellZA 797 74 319ms 4 Jan 2022 118th rolandbogdan 797 74 308ms 28 Jul 2022 118th Alex-Huggett 🇬🇧 797 74 310ms 13 Apr 2024 123rd jsermini2 787 75 319ms 21 Nov 2021 123rd pikti 787 75 317ms 21 Nov 2021 123rd ertz1ertz 787 75 347ms 12 Jul 2024 126th mort607e 776 76 315ms 21 Nov 2021 126th pandapawskat 776 76 312ms 21 Nov 2021 126th Skleni 776 76 317ms 29 Mar 2023 129th Smetalo 766 77 318ms 25 Aug 2022 130th Hankinabag 756 78 322ms 21 Nov 2021 130th HassanAliKadhem 🇧🇭 756 78 322ms 16 Jan 2022 132nd arndta 747 79 343ms 21 Nov 2021 132nd Maximizer02 747 79 319ms 18 Oct 2023 134th jwalaszek 738 80 330ms 21 Nov 2021 135th ms-tingliang 728 81 312ms 5 Aug 2022 136th sm1lko 694 85 329ms 12 Oct 2022 137th danmunozmunoz 🇪🇸 608 97 344ms 24 Nov 2022 138th JacobStanleyJones 596 99 332ms 21 Nov 2021 138th Xwilarg 🇫🇷 596 99 341ms 21 Nov 2021 138th artisiole 🇺🇸 596 99 318ms 4 Mar 2022 141st Jennifervl 🇸🇪 573 103 319ms 11 Dec 2021 142nd HumanEquivalentUnit 567 104 330ms 28 Dec 2021 143rd nickdevore 557 106 308ms 21 Nov 2021 143rd bilal2709 557 106 364ms 3 Sep 2025 145th horvaro 532 111 325ms 15 Jun 2023 146th liorksh 522 113 325ms 21 Nov 2021 147th RobertEves92 🇬🇧 504 117 318ms 15 May 2024 148th Cool-Ari 496 119 316ms 7 Aug 2022 149th Pyro569 488 121 312ms 20 Jul 2023 150th hdformat 454 130 327ms 21 Nov 2021 151st kevinnaviapaiva 404 146 318ms 28 Feb 2025 152nd JoSpaghettiMan 399 148 354ms 2 Oct 2025 153rd Philipuss1 378 156 315ms 21 Nov 2021 154th mokymok 🇺🇸 66 892 316ms 21 Nov 2021 154th retrohun 66 892 304ms 27 Dec 2022 154th Mabeloid 🇳🇴 66 892 361ms 22 Sep 2024 157th KatieLG-Transpiler 🇬🇧 66 896 361ms 23 Jun 2022 First Prev 81–157 of 157
