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 719th KatieLG 🇬🇧 898 63 347ms 17 Oct 2022 722nd nwellnhof 🇩🇪 896 89 271ms 3 Sep 2020 722nd MeWhenI 🇻🇦 896 89 274ms 10 Oct 2022 722nd DialFrost 🇸🇬 896 89 246ms 8 Nov 2023 722nd dokutan 896 89 266ms 25 Sep 2024 722nd fuzzylojik-golf 🇺🇸 896 89 267ms 15 Jul 2025 722nd KasperKivimaeki 🇫🇮 896 89 263ms 29 Sep 2025 722nd edsrzf 🇳🇿 896 89 312ms 11 hours ago 729th Yewzir 🇧🇪 895 70 420ms 17 Nov 2023 730th canissimia 🇦🇶 895 83 6ms 1 Aug 2023 731st ovs-code 🇩🇪 895 89 7ms 8 Jul 2024 732nd MeWhenI 🇻🇦 894 45 127ms 3 Aug 2024 732nd dokutan 894 45 127ms 25 Sep 2024 734th clockworknazo 894 54 3ms 23 Oct 2022 735th primo-ppcg 🇹🇭 893 36 50ms 8 Dec 2018 735th nwellnhof 🇩🇪 893 36 37ms 28 Apr 2020 735th Waffle3z 893 36 46ms 14 Jul 2021 735th lynn 893 36 36ms 10 Sep 2021 735th sean-niemann 🇺🇸 893 36 37ms 5 Apr 2022 735th jared-hughes 893 36 32ms 9 Sep 2022 735th MeWhenI 🇻🇦 893 36 50ms 10 Oct 2022 735th Steffan153 🇫🇮 893 36 35ms 26 Dec 2022 735th ovs-code 🇩🇪 893 36 49ms 9 May 2023 735th DialFrost 🇸🇬 893 36 36ms 8 Nov 2023 735th pardouin 🇫🇷 893 36 32ms 21 Aug 2024 735th dokutan 893 36 37ms 25 Sep 2024 735th FlyingPenguin223 893 36 41ms 17 Dec 2024 735th fuzzylojik-golf 🇺🇸 893 36 32ms 25 Aug 2025 749th ANDREYDEN 893 45 9ms 12 Jan 2019 749th dee-gomma 893 45 8ms 27 Mar 2019 749th Cr3aHal0 893 45 9ms 2 Jul 2019 749th StefanTifrea 893 45 9ms 15 Jul 2020 749th Non-J 893 45 9ms 27 Sep 2020 749th ryandougc 893 45 9ms 17 Dec 2020 749th ForkKILLET 🇨🇳 893 45 9ms 18 Feb 2021 749th UBKorkut 893 45 8ms 10 Mar 2021 749th neihousaigaai 893 45 8ms 8 May 2021 749th SpareManiKatti 893 45 9ms 14 Oct 2021 749th danielb7390 893 45 8ms 9 Mar 2022 749th WebDevPT 🇵🇹 893 45 9ms 10 Mar 2022 749th CiucaRazvan 893 45 9ms 29 Jul 2022 749th SirFireball3521 893 45 9ms 1 Nov 2022 749th astdefu 893 45 8ms 10 Dec 2022 749th Betuaredead 893 45 9ms 4 Jan 2023 749th Mazn3k 893 45 9ms 15 Mar 2023 749th ejini6969 893 45 9ms 25 Mar 2023 749th raszpi 🇭🇺 893 45 9ms 2 Sep 2023 749th mulmul9 🇭🇺 893 45 9ms 7 Sep 2023 749th FruzsinaLenti 893 45 8ms 8 Sep 2023 749th junkondo-jp 893 45 9ms 6 May 2024 749th Mabeloid 🇳🇴 893 45 8ms 14 Oct 2024 749th shandriy 893 45 9ms 8 Nov 2024 749th Salutations45 893 45 8ms 12 Nov 2024 749th 823126 893 45 9ms 9 Dec 2024 749th Garklein 🇨🇦 893 45 9ms 6 Jan 2025 749th jake6192 893 45 8ms 17 May 2025 749th albanian-laundromat 893 45 9ms 1 Sep 2025 749th iczelia 🇩🇪 893 45 8ms 25 Sep 2025 779th primo-ppcg 🇹🇭 892 131 11ms 2 Aug 2023 780th Steffan153 🇫🇮 891 52 4ms 16 Apr 2023 780th Lydxn 🇨🇦 891 52 4ms 12 May 2023 780th GrayJoKing 🇦🇺 891 52 4ms 14 Aug 2023 780th dokutan 891 52 4ms 25 Sep 2024 780th kg583 🇺🇸 891 52 4ms 10 days ago 780th edsrzf 🇳🇿 891 52 4ms 6 days ago 786th andersk 🇺🇸 891 60 115ms 20 Mar 2020 786th primo-ppcg 🇹🇭 891 60 122ms 2 May 2020 786th JayXon 🇺🇸 891 60 124ms 23 Aug 2021 786th Lydxn 🇨🇦 891 60 120ms 24 Aug 2021 786th lynn 891 60 120ms 10 Sep 2021 786th Super-Pizza 🇨🇦 891 60 124ms 22 May 2023 792nd Shanethegamer 🇺🇸 891 64 104ms 15 Apr 2025 792nd snoozingnewt 🇨🇦 891 64 96ms 20 days ago 792nd emgordon154 891 64 94ms 19 days ago 792nd DialFrost 🇸🇬 891 64 95ms 18 days ago 796th saito-ta 🇯🇵 890 42 3ms 22 Jun 2023 797th edsrzf 🇳🇿 890 57 10ms 17 Dec 2024 798th kg583 🇺🇸 890 62 39ms 13 Feb 2025 799th emgordon154 889 70 387ms 25 Sep 2025 799th HumanoidCPU 889 70 443ms 8 Nov 2025 First Prev 721–800 of 4,762 Next Last