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 294th jbt 935 43 8ms 26 Dec 2023 294th wlaud9 935 43 8ms 8 Feb 2024 294th weliveinhell 🇭🇹 935 43 8ms 23 Jul 2024 294th pardouin 🇫🇷 935 43 124ms 5 Aug 2024 294th Lydxn 🇨🇦 935 43 119ms 6 Aug 2024 294th JayXon 🇺🇸 935 43 116ms 9 Aug 2024 294th edsrzf 🇳🇿 935 43 9ms 14 Sep 2024 294th acollett89 935 43 9ms 12 Jun 2025 329th sean-niemann 🇺🇸 935 47 2ms 9 Sep 2022 329th Lydxn 🇨🇦 935 47 2ms 9 Sep 2022 329th JayXon 🇺🇸 935 47 2ms 10 Sep 2022 329th GrayJoKing 🇦🇺 935 47 2ms 10 Sep 2022 329th MeWhenI 🇻🇦 935 47 2ms 10 Oct 2022 329th Steffan153 🇫🇮 935 47 2ms 9 Feb 2023 329th DialFrost 🇸🇬 935 47 2ms 8 Nov 2023 329th dokutan 935 47 2ms 25 Sep 2024 337th JayXon 🇺🇸 935 56 2ms 9 Feb 2022 337th HPWiz 🇳🇿 935 56 581ms 24 Nov 2022 337th rhdqor213 935 56 410ms 2 Aug 2024 337th KasperKivimaeki 🇫🇮 935 56 574ms 17 Dec 2024 337th DialFrost 🇸🇬 935 56 564ms 17 Dec 2024 342nd Lydxn 🇨🇦 933 52 94ms 14 Oct 2022 342nd JayXon 🇺🇸 933 52 96ms 14 Oct 2022 342nd Steffan153 🇫🇮 933 52 102ms 26 Dec 2022 342nd sean-niemann 🇺🇸 933 52 100ms 17 Feb 2023 342nd DialFrost 🇸🇬 933 52 94ms 8 Nov 2023 342nd dokutan 933 52 98ms 25 Sep 2024 348th JayXon 🇺🇸 932 44 3,954ms 27 Oct 2024 349th NewDefectus 🇮🇱 931 44 53ms 15 Oct 2021 349th AdrienHache 🇫🇷 931 44 50ms 31 Oct 2024 351st DialFrost 🇸🇬 930 39 702ms 29 Aug 2025 351st sean-niemann 🇺🇸 930 39 646ms 12 Sep 2025 351st edsrzf 🇳🇿 930 39 642ms 4 days ago 354th primo-ppcg 🇹🇭 930 48 36ms 13 Jun 2022 354th Lydxn 🇨🇦 930 48 36ms 13 Jun 2022 354th JayXon 🇺🇸 930 48 36ms 9 Sep 2022 357th kg583 🇺🇸 930 58 5ms 21 Aug 2025 358th primo-ppcg 🇹🇭 929 44 80ms 2 May 2020 358th lynn 929 44 79ms 10 Sep 2021 360th DialFrost 🇸🇬 929 67 421ms 24 Sep 2025 360th sean-niemann 🇺🇸 929 67 476ms 24 Sep 2025 360th nwellnhof 🇩🇪 929 67 467ms 25 Sep 2025 360th namelessiw 929 67 453ms 4 Oct 2025 360th stefangimmillaro 929 67 433ms 6 Oct 2025 360th b-illy 🇬🇧 929 67 709ms 9 Oct 2025 360th MeWhenI 🇻🇦 929 67 496ms 7 Nov 2025 360th dokutan 929 67 484ms 18 days ago 368th Lydxn 🇨🇦 928 43 368ms 16 Jan 2024 368th b-illy 🇬🇧 928 43 374ms 7 Sep 2024 368th fuzzylojik-golf 🇺🇸 928 43 376ms 2 Jul 2025 371st Lydxn 🇨🇦 928 52 3ms 30 Sep 2022 372nd pardouin 🇫🇷 927 50 3ms 25 Apr 2025 373rd Attero 🇸🇪 927 61 311ms 21 Nov 2021 373rd nwellnhof 🇩🇪 927 61 311ms 21 Nov 2021 373rd sean-niemann 🇺🇸 927 61 326ms 21 Nov 2021 373rd tomtheisen 🇺🇸 927 61 315ms 21 Nov 2021 373rd MeWhenI 🇻🇦 927 61 322ms 10 Oct 2022 373rd Steffan153 🇫🇮 927 61 320ms 1 Jan 2023 373rd stefangimmillaro 927 61 327ms 4 Aug 2023 373rd DialFrost 🇸🇬 927 61 381ms 8 Nov 2023 373rd namelessiw 927 61 361ms 11 Jul 2024 373rd dokutan 927 61 343ms 25 Sep 2024 373rd pardouin 🇫🇷 927 61 348ms 26 Sep 2024 373rd b-illy 🇬🇧 927 61 320ms 21 Jan 2025 373rd fuzzylojik-golf 🇺🇸 927 61 374ms 28 Jun 2025 386th JayXon 🇺🇸 927 86 265ms 9 Feb 2022 387th Lydxn 🇨🇦 926 67 25ms 16 Apr 2022 388th inventshah 925 37 72ms 12 Dec 2022 388th DialFrost 🇸🇬 925 37 68ms 22 Oct 2023 390th sean-niemann 🇺🇸 925 55 9ms 25 Mar 2025 391st janbehrens 🇩🇪 924 77 74ms 8 Jan 2022 391st solmyr2000 924 77 65ms 21 Jun 2022 391st annaproxy 924 77 71ms 7 Jan 2023 391st Alex-x90 🇺🇸 924 77 78ms 19 Feb 2023 391st roupiq 🇵🇱 924 77 65ms 17 Nov 2023 391st ovs-code 🇩🇪 924 77 71ms 3 Jun 2024 391st tailorspy 924 77 60ms 23 Sep 2024 391st luuumine 🇫🇷 924 77 72ms 16 Nov 2025 399th MeWhenI 🇻🇦 923 42 4ms 20 Oct 2022 400th Steffan153 🇫🇮 923 55 7ms 13 Jul 2024 First Prev 321–400 of 4,758 Next Last