The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Leap Years in Go 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 1st masterada 1,000 85 271ms 26 Mar 2021 1st Lydxn 🇨🇦 1,000 85 266ms 10 Feb 2022 3rd JayXon 🇺🇸 988 86 265ms 9 Feb 2022 4th primo-ppcg 🇹🇭 977 87 271ms 2 May 2020 5th stefangimmillaro 966 88 276ms 4 Aug 2023 5th Steffan153 🇫🇮 966 88 281ms 3 Aug 2024 5th sean-niemann 🇺🇸 966 88 267ms 25 Mar 2025 8th nwellnhof 🇩🇪 955 89 271ms 3 Sep 2020 8th MeWhenI 🇻🇦 955 89 274ms 10 Oct 2022 8th DialFrost 🇸🇬 955 89 246ms 8 Nov 2023 8th dokutan 955 89 266ms 25 Sep 2024 8th fuzzylojik-golf 🇺🇸 955 89 267ms 15 Jul 2025 8th KasperKivimaeki 🇫🇮 955 89 263ms 29 Sep 2025 8th edsrzf 🇳🇿 955 89 312ms 75 mins ago 15th CaedenHarper 🇨🇦 944 90 257ms 12 Nov 2025 16th bendiscz 934 91 266ms 16 Apr 2020 16th cywong-amino 🇭🇰 934 91 263ms 20 May 2020 16th emplv 🇱🇻 934 91 267ms 1 Oct 2020 16th Irratix 🇳🇱 934 91 275ms 18 Oct 2020 16th janbehrens 🇩🇪 934 91 273ms 22 May 2021 16th voytxt 🇨🇿 934 91 261ms 3 Feb 2023 16th kkoenig 934 91 268ms 10 Sep 2025 23rd marcin7Cd 924 92 276ms 10 Jan 2021 24th MahlerFive 🇨🇦 914 93 270ms 19 Apr 2020 24th jamesallured 914 93 269ms 22 Apr 2020 24th 0xjac 🇨🇭 914 93 263ms 26 Apr 2020 24th cduerm 914 93 268ms 12 May 2020 24th argusdusty 🇺🇸 914 93 275ms 26 Dec 2020 24th Shanethegamer 🇺🇸 914 93 270ms 22 May 2021 24th msbranicky 914 93 263ms 27 Aug 2023 24th elgan65536 914 93 283ms 23 Oct 2023 24th Yewzir 🇧🇪 914 93 267ms 7 Feb 2024 24th albanian-laundromat 914 93 255ms 16 days ago 34th ToriTheChicken 904 94 269ms 22 Sep 2021 34th thisishowmymindworks 🇳🇴 904 94 284ms 22 Sep 2021 34th j-Ewan 904 94 267ms 11 Mar 2022 34th snoozingnewt 🇨🇦 904 94 264ms 26 Sep 2025 38th aivarasbaranauskas 895 95 278ms 20 Apr 2020 38th b97tsk 895 95 271ms 20 Apr 2020 38th taklam 895 95 268ms 20 May 2020 38th dpatterbee 895 95 266ms 20 Aug 2020 38th cure-honey 🇯🇵 895 95 275ms 5 Jul 2021 38th ibeucaly 895 95 284ms 22 Oct 2021 38th kimbo 🇺🇸 895 95 295ms 23 Dec 2022 38th jerrandolph 895 95 275ms 21 Oct 2023 46th potatoattack 885 96 272ms 19 Apr 2020 47th guliyevemil1 🇦🇿 876 97 260ms 18 Apr 2020 47th Betuaredead 876 97 265ms 4 Jan 2023 47th targrik 876 97 260ms 29 Jun 2025 47th FlorianCassayre 🇫🇷 876 97 287ms 19 Jul 2025 51st astdefu 867 98 271ms 11 Dec 2022 51st Matter1024 🇮🇳 867 98 267ms 2 Jul 2025 53rd stuartcarnie 859 99 264ms 18 Apr 2020 53rd dteague3989 859 99 260ms 25 May 2023 53rd StronkCheese 🇺🇸 859 99 267ms 20 Feb 2024 56th roguh 🇬🇹 850 100 284ms 14 Jan 2024 56th Loag 850 100 264ms 7 Sep 2024 58th geezyx 842 101 267ms 16 Apr 2020 58th nwwdles 842 101 271ms 16 Apr 2020 58th JRaspass 🇬🇧 842 101 293ms 20 May 2022 58th keelimeguy 🇺🇸 842 101 263ms 8 May 2025 62nd 1231234md5 🇨🇳 833 102 264ms 11 Dec 2023 62nd martindotexe 🇳🇴 833 102 251ms 22 Apr 2025 64th jgbaldwinbrown 817 104 280ms 30 Jun 2021 65th 007lock 810 105 273ms 10 May 2020 65th hjo33 810 105 262ms 26 Aug 2022 67th KrausRaus 🇺🇸 802 106 270ms 28 Dec 2021 68th Smetalo 794 107 268ms 25 Aug 2022 69th hill399 752 113 283ms 16 Apr 2020 70th eli-siegel 702 121 271ms 23 Jun 2023 71st mogensen 675 126 268ms 16 Apr 2020 71st danieldooley 675 126 264ms 22 Apr 2020 73rd Bodo171 669 127 261ms 15 Jan 2023 74th henkman 630 135 263ms 1 Jun 2020 75th CuboidRaptor 🇨🇦 612 139 269ms 22 Jan 2022 76th mazzegi 574 148 269ms 16 Apr 2020 77th steven-purcell 563 151 270ms 30 Jul 2023 78th Dasio 467 182 287ms 16 Apr 2020 79th KatieLG 🇬🇧 123 690 258ms 20 days ago 80th HumanoidCPU 109 777 262ms 26 Aug 2024 1–80 of 84 Next Last