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 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 474th sean-niemann 🇺🇸 918 46 1ms 12 Jan 2023 474th DialFrost 🇸🇬 918 46 2ms 8 Nov 2023 474th dokutan 918 46 2ms 25 Sep 2024 474th FlyingPenguin223 918 46 2ms 17 Dec 2024 474th edsrzf 🇳🇿 918 46 2ms 6 days ago 486th lynn 918 60 26ms 11 Jul 2023 486th Lydxn 🇨🇦 918 60 25ms 11 Jul 2023 488th primo-ppcg 🇹🇭 917 87 271ms 2 May 2020 489th DialFrost 🇸🇬 916 28 251ms 6 days ago 490th GrayJoKing 🇦🇺 916 53 99ms 18 Oct 2022 491st Lydxn 🇨🇦 915 55 4ms 16 Jul 2023 492nd voytxt 🇨🇿 915 68 432ms 25 Sep 2025 492nd ScottHamper 915 68 443ms 20 days ago 494th rambox11 914 44 9ms 20 Dec 2018 494th skps2010 914 44 9ms 4 Jan 2019 494th obarakon 914 44 8ms 9 Jan 2019 494th elisherer 🇮🇱 914 44 9ms 28 Mar 2019 494th goldenice 914 44 9ms 4 Apr 2019 494th user189032 914 44 9ms 29 May 2019 494th marcin7Cd 914 44 9ms 13 Mar 2020 494th ondras 914 44 9ms 3 May 2020 494th daisy-lau 914 44 8ms 20 May 2020 494th efgen 914 44 9ms 12 Jun 2020 494th itsh01 914 44 9ms 15 Jul 2020 494th thisishowmymindworks 🇳🇴 914 44 9ms 20 Jul 2020 494th ToriTheChicken 914 44 9ms 21 Jul 2020 494th ehouais 914 44 9ms 23 Aug 2020 494th Athe81 914 44 9ms 30 Oct 2020 494th jn-lp 🇺🇦 914 44 9ms 1 Nov 2020 494th pandapawskat 914 44 8ms 3 Dec 2020 494th boxjelly 914 44 8ms 14 Feb 2021 494th blader0x 914 44 8ms 28 Mar 2021 494th heypwesto 🇳🇿 914 44 8ms 20 Apr 2021 494th Shanethegamer 🇺🇸 914 44 8ms 22 May 2021 494th Natanaelel 🇸🇪 914 44 8ms 1 Oct 2021 494th alex-oser 🇲🇰 914 44 9ms 5 Oct 2021 494th igmcdowell 914 44 8ms 25 Nov 2021 494th shellbertt 🇨🇦 914 44 8ms 3 Dec 2021 494th ZakkkkAttackkkk 🇵🇭 914 44 9ms 17 Dec 2021 494th fitzdotlol 🇺🇸 914 44 9ms 8 Mar 2022 494th vincens2005 🇺🇸 914 44 9ms 30 Mar 2022 494th otubby 914 44 8ms 30 Mar 2022 494th NathanGabrielson 914 44 8ms 30 Mar 2022 494th inverseLorentz 🇦🇺 914 44 8ms 28 Jun 2022 494th two-bad 🇬🇧 914 44 8ms 5 Jul 2022 494th aksyristos 914 44 9ms 28 Oct 2022 494th scpchicken 🇵🇼 914 44 9ms 22 Feb 2023 494th Kesefon 914 44 9ms 25 Apr 2023 494th dteague3989 914 44 8ms 27 May 2023 494th unfinishedprogram 914 44 9ms 4 Jul 2023 494th Davr1 🇨🇿 914 44 9ms 15 Oct 2023 494th Yewzir 🇧🇪 914 44 9ms 15 Oct 2023 494th dylanarmstrong 914 44 8ms 22 Jan 2024 494th hacker112 🇸🇪 914 44 9ms 22 Jun 2024 494th GrayJoKing 🇦🇺 914 44 127ms 3 Aug 2024 494th lukegustafson 🇺🇸 914 44 119ms 8 Aug 2024 494th DialFrost 🇸🇬 914 44 119ms 8 Aug 2024 494th sean-niemann 🇺🇸 914 44 119ms 8 Aug 2024 494th voytxt 🇨🇿 914 44 119ms 8 Aug 2024 494th Steffan153 🇫🇮 914 44 123ms 8 Aug 2024 494th rucin93 🇵🇱 914 44 122ms 9 Aug 2024 494th piano-miles 914 44 9ms 6 Sep 2024 494th kovdmm 914 44 8ms 13 Oct 2024 494th CaedenHarper 🇨🇦 914 44 9ms 22 Oct 2024 494th emplv 🇱🇻 914 44 122ms 29 Oct 2024 494th XenThe 🇬🇧 914 44 9ms 7 Jun 2025 494th olleicua 🇺🇸 914 44 9ms 13 Aug 2025 494th LordSir101 914 44 9ms 18 Aug 2025 549th GolfingSuccess 🇬🇷 913 23 38ms 14 Aug 2022 549th primo-ppcg 🇹🇭 913 23 56ms 15 Feb 2023 551st retrohun 912 31 2ms 30 Apr 2019 551st scpchicken 🇵🇼 912 31 2ms 18 Jun 2023 551st fuzzylojik-golf 🇺🇸 912 31 3ms 22 May 2025 554th initram 912 62 320ms 21 Nov 2021 554th janbehrens 🇩🇪 912 62 321ms 21 Nov 2021 554th jmhowl 912 62 321ms 21 Nov 2021 554th ScottHamper 912 62 314ms 21 Nov 2021 554th Irratix 🇳🇱 912 62 322ms 13 Dec 2021 554th simon-biber 912 62 318ms 7 Feb 2022 554th annaproxy 912 62 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