The Calendar hole will go live in approximately 13 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 471st FlyingPenguin223 918 46 2ms 17 Dec 2024 471st edsrzf 🇳🇿 918 46 2ms 3 days ago 483rd lynn 918 60 26ms 11 Jul 2023 483rd Lydxn 🇨🇦 918 60 25ms 11 Jul 2023 485th DialFrost 🇸🇬 916 28 251ms 3 days ago 486th GrayJoKing 🇦🇺 916 53 99ms 18 Oct 2022 487th primo-ppcg 🇹🇭 916 87 271ms 2 May 2020 488th Lydxn 🇨🇦 915 55 4ms 16 Jul 2023 489th voytxt 🇨🇿 915 68 432ms 25 Sep 2025 489th ScottHamper 915 68 443ms 18 days ago 491st rambox11 914 44 9ms 20 Dec 2018 491st skps2010 914 44 9ms 4 Jan 2019 491st obarakon 914 44 8ms 9 Jan 2019 491st elisherer 🇮🇱 914 44 9ms 28 Mar 2019 491st goldenice 914 44 9ms 4 Apr 2019 491st user189032 914 44 9ms 29 May 2019 491st marcin7Cd 914 44 9ms 13 Mar 2020 491st ondras 914 44 9ms 3 May 2020 491st daisy-lau 914 44 8ms 20 May 2020 491st efgen 914 44 9ms 12 Jun 2020 491st itsh01 914 44 9ms 15 Jul 2020 491st thisishowmymindworks 🇳🇴 914 44 9ms 20 Jul 2020 491st ToriTheChicken 914 44 9ms 21 Jul 2020 491st ehouais 914 44 9ms 23 Aug 2020 491st Athe81 914 44 9ms 30 Oct 2020 491st jn-lp 🇺🇦 914 44 9ms 1 Nov 2020 491st pandapawskat 914 44 8ms 3 Dec 2020 491st boxjelly 914 44 8ms 14 Feb 2021 491st blader0x 914 44 8ms 28 Mar 2021 491st heypwesto 🇳🇿 914 44 8ms 20 Apr 2021 491st Shanethegamer 🇺🇸 914 44 8ms 22 May 2021 491st Natanaelel 🇸🇪 914 44 8ms 1 Oct 2021 491st alex-oser 🇲🇰 914 44 9ms 5 Oct 2021 491st igmcdowell 914 44 8ms 25 Nov 2021 491st shellbertt 🇨🇦 914 44 8ms 3 Dec 2021 491st ZakkkkAttackkkk 🇵🇭 914 44 9ms 17 Dec 2021 491st fitzdotlol 🇺🇸 914 44 9ms 8 Mar 2022 491st vincens2005 🇺🇸 914 44 9ms 30 Mar 2022 491st otubby 914 44 8ms 30 Mar 2022 491st NathanGabrielson 914 44 8ms 30 Mar 2022 491st inverseLorentz 🇦🇺 914 44 8ms 28 Jun 2022 491st two-bad 🇬🇧 914 44 8ms 5 Jul 2022 491st aksyristos 914 44 9ms 28 Oct 2022 491st scpchicken 🇵🇼 914 44 9ms 22 Feb 2023 491st Kesefon 914 44 9ms 25 Apr 2023 491st dteague3989 914 44 8ms 27 May 2023 491st unfinishedprogram 914 44 9ms 4 Jul 2023 491st Davr1 🇨🇿 914 44 9ms 15 Oct 2023 491st Yewzir 🇧🇪 914 44 9ms 15 Oct 2023 491st dylanarmstrong 914 44 8ms 22 Jan 2024 491st hacker112 🇸🇪 914 44 9ms 22 Jun 2024 491st GrayJoKing 🇦🇺 914 44 127ms 3 Aug 2024 491st lukegustafson 🇺🇸 914 44 119ms 8 Aug 2024 491st DialFrost 🇸🇬 914 44 119ms 8 Aug 2024 491st sean-niemann 🇺🇸 914 44 119ms 8 Aug 2024 491st voytxt 🇨🇿 914 44 119ms 8 Aug 2024 491st Steffan153 🇫🇮 914 44 123ms 8 Aug 2024 491st rucin93 🇵🇱 914 44 122ms 9 Aug 2024 491st piano-miles 914 44 9ms 6 Sep 2024 491st kovdmm 914 44 8ms 13 Oct 2024 491st CaedenHarper 🇨🇦 914 44 9ms 22 Oct 2024 491st emplv 🇱🇻 914 44 122ms 29 Oct 2024 491st XenThe 🇬🇧 914 44 9ms 7 Jun 2025 491st olleicua 🇺🇸 914 44 9ms 13 Aug 2025 491st LordSir101 914 44 9ms 18 Aug 2025 546th GolfingSuccess 🇬🇷 913 23 38ms 14 Aug 2022 546th primo-ppcg 🇹🇭 913 23 56ms 15 Feb 2023 548th retrohun 912 31 2ms 30 Apr 2019 548th scpchicken 🇵🇼 912 31 2ms 18 Jun 2023 548th fuzzylojik-golf 🇺🇸 912 31 3ms 22 May 2025 551st initram 912 62 320ms 21 Nov 2021 551st janbehrens 🇩🇪 912 62 321ms 21 Nov 2021 551st jmhowl 912 62 321ms 21 Nov 2021 551st ScottHamper 912 62 314ms 21 Nov 2021 551st Irratix 🇳🇱 912 62 322ms 13 Dec 2021 551st simon-biber 912 62 318ms 7 Feb 2022 551st annaproxy 912 62 316ms 15 Mar 2022 551st voytxt 🇨🇿 912 62 323ms 7 Apr 2022 551st logicolor 912 62 320ms 27 Apr 2022 551st Gaddy 🇫🇷 912 62 321ms 2 May 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