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 475th b10011 🇫🇮 918 46 1ms 5 Jan 2023 475th sean-niemann 🇺🇸 918 46 1ms 12 Jan 2023 475th DialFrost 🇸🇬 918 46 2ms 8 Nov 2023 475th dokutan 918 46 2ms 25 Sep 2024 475th FlyingPenguin223 918 46 2ms 17 Dec 2024 475th edsrzf 🇳🇿 918 46 2ms 6 days ago 487th lynn 918 60 26ms 11 Jul 2023 487th Lydxn 🇨🇦 918 60 25ms 11 Jul 2023 489th primo-ppcg 🇹🇭 917 87 271ms 2 May 2020 490th DialFrost 🇸🇬 916 28 251ms 6 days ago 491st GrayJoKing 🇦🇺 916 53 99ms 18 Oct 2022 492nd Lydxn 🇨🇦 915 55 4ms 16 Jul 2023 493rd voytxt 🇨🇿 915 68 432ms 25 Sep 2025 493rd ScottHamper 915 68 443ms 21 days ago 495th rambox11 914 44 9ms 20 Dec 2018 495th skps2010 914 44 9ms 4 Jan 2019 495th obarakon 914 44 8ms 9 Jan 2019 495th elisherer 🇮🇱 914 44 9ms 28 Mar 2019 495th goldenice 914 44 9ms 4 Apr 2019 495th user189032 914 44 9ms 29 May 2019 495th marcin7Cd 914 44 9ms 13 Mar 2020 495th ondras 914 44 9ms 3 May 2020 495th daisy-lau 914 44 8ms 20 May 2020 495th efgen 914 44 9ms 12 Jun 2020 495th itsh01 914 44 9ms 15 Jul 2020 495th thisishowmymindworks 🇳🇴 914 44 9ms 20 Jul 2020 495th ToriTheChicken 914 44 9ms 21 Jul 2020 495th ehouais 914 44 9ms 23 Aug 2020 495th Athe81 914 44 9ms 30 Oct 2020 495th jn-lp 🇺🇦 914 44 9ms 1 Nov 2020 495th pandapawskat 914 44 8ms 3 Dec 2020 495th boxjelly 914 44 8ms 14 Feb 2021 495th blader0x 914 44 8ms 28 Mar 2021 495th heypwesto 🇳🇿 914 44 8ms 20 Apr 2021 495th Shanethegamer 🇺🇸 914 44 8ms 22 May 2021 495th Natanaelel 🇸🇪 914 44 8ms 1 Oct 2021 495th alex-oser 🇲🇰 914 44 9ms 5 Oct 2021 495th igmcdowell 914 44 8ms 25 Nov 2021 495th shellbertt 🇨🇦 914 44 8ms 3 Dec 2021 495th ZakkkkAttackkkk 🇵🇭 914 44 9ms 17 Dec 2021 495th fitzdotlol 🇺🇸 914 44 9ms 8 Mar 2022 495th vincens2005 🇺🇸 914 44 9ms 30 Mar 2022 495th otubby 914 44 8ms 30 Mar 2022 495th NathanGabrielson 914 44 8ms 30 Mar 2022 495th inverseLorentz 🇦🇺 914 44 8ms 28 Jun 2022 495th two-bad 🇬🇧 914 44 8ms 5 Jul 2022 495th aksyristos 914 44 9ms 28 Oct 2022 495th scpchicken 🇵🇼 914 44 9ms 22 Feb 2023 495th Kesefon 914 44 9ms 25 Apr 2023 495th dteague3989 914 44 8ms 27 May 2023 495th unfinishedprogram 914 44 9ms 4 Jul 2023 495th Davr1 🇨🇿 914 44 9ms 15 Oct 2023 495th Yewzir 🇧🇪 914 44 9ms 15 Oct 2023 495th dylanarmstrong 914 44 8ms 22 Jan 2024 495th hacker112 🇸🇪 914 44 9ms 22 Jun 2024 495th GrayJoKing 🇦🇺 914 44 127ms 3 Aug 2024 495th lukegustafson 🇺🇸 914 44 119ms 8 Aug 2024 495th DialFrost 🇸🇬 914 44 119ms 8 Aug 2024 495th sean-niemann 🇺🇸 914 44 119ms 8 Aug 2024 495th voytxt 🇨🇿 914 44 119ms 8 Aug 2024 495th Steffan153 🇫🇮 914 44 123ms 8 Aug 2024 495th rucin93 🇵🇱 914 44 122ms 9 Aug 2024 495th piano-miles 914 44 9ms 6 Sep 2024 495th kovdmm 914 44 8ms 13 Oct 2024 495th CaedenHarper 🇨🇦 914 44 9ms 22 Oct 2024 495th emplv 🇱🇻 914 44 122ms 29 Oct 2024 495th XenThe 🇬🇧 914 44 9ms 7 Jun 2025 495th olleicua 🇺🇸 914 44 9ms 13 Aug 2025 495th LordSir101 914 44 9ms 18 Aug 2025 550th GolfingSuccess 🇬🇷 913 23 38ms 14 Aug 2022 550th primo-ppcg 🇹🇭 913 23 56ms 15 Feb 2023 552nd retrohun 912 31 2ms 30 Apr 2019 552nd scpchicken 🇵🇼 912 31 2ms 18 Jun 2023 552nd fuzzylojik-golf 🇺🇸 912 31 3ms 22 May 2025 555th initram 912 62 320ms 21 Nov 2021 555th janbehrens 🇩🇪 912 62 321ms 21 Nov 2021 555th jmhowl 912 62 321ms 21 Nov 2021 555th ScottHamper 912 62 314ms 21 Nov 2021 555th Irratix 🇳🇱 912 62 322ms 13 Dec 2021 555th simon-biber 912 62 318ms 7 Feb 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