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 869th Andriamanitra 🇫🇮 883 48 15ms 10 Jul 2023 869th stefangimmillaro 883 48 9ms 18 Jul 2023 869th Alex-x90 🇺🇸 883 48 9ms 27 Jul 2023 869th sultan 883 48 9ms 16 Feb 2024 869th driri85 883 48 9ms 16 Feb 2024 869th wen1now 883 48 9ms 1 Mar 2024 869th cpchrispye 883 48 16ms 20 Apr 2024 869th 5cw 🇺🇸 883 48 16ms 6 May 2024 869th egasyelir 883 48 15ms 15 Jul 2024 869th bzijlema 🇳🇱 883 48 15ms 11 Sep 2024 869th moustave 883 48 16ms 9 Jan 2025 869th rollershutter 883 48 16ms 21 Jan 2025 869th Yax42 🇫🇷 883 48 9ms 17 Jun 2025 869th luuumine 🇫🇷 883 48 10ms 29 Oct 2025 895th GrayJoKing 🇦🇺 883 57 4ms 16 Jul 2023 896th Wanderkind 🇰🇷 883 71 458ms 9 Jan 2023 897th voytxt 🇨🇿 882 35 981ms 16 May 2022 897th lynn 882 35 886ms 1 Jun 2022 897th emgordon154 882 35 957ms 5 Oct 2025 897th edsrzf 🇳🇿 882 35 998ms 7 hours ago 901st emplv 🇱🇻 882 55 99ms 26 Oct 2022 901st voytxt 🇨🇿 882 55 98ms 1 Jan 2023 901st stefangimmillaro 882 55 98ms 20 Jun 2023 901st mulmul9 🇭🇺 882 55 97ms 8 Sep 2023 905th MeWhenI 🇻🇦 881 46 4ms 31 Dec 2024 906th sean-niemann 🇺🇸 880 47 95ms 20 Mar 2022 906th MeWhenI 🇻🇦 880 47 103ms 10 Oct 2022 906th Steffan153 🇫🇮 880 47 97ms 9 Feb 2023 906th DialFrost 🇸🇬 880 47 98ms 8 Nov 2023 906th dokutan 880 47 103ms 25 Sep 2024 911th DialFrost 🇸🇬 880 109 431ms 7 Mar 2025 911th MeWhenI 🇻🇦 880 109 490ms 28 Mar 2025 913th inventshah 879 50 3ms 9 Sep 2022 913th janbehrens 🇩🇪 879 50 2ms 14 Sep 2022 915th Steffan153 🇫🇮 878 39 70ms 26 Dec 2022 915th Alessandro-Balconi 🇮🇹 878 39 72ms 26 Dec 2022 917th Re-Adventures 🇮🇳 878 81 76ms 2 Jan 2022 917th Betuaredead 878 81 61ms 4 Jan 2023 917th aksyristos 878 81 60ms 30 Jan 2023 917th CatsAreFluffy 878 81 60ms 19 Feb 2023 917th namcartoon06 878 81 84ms 30 Jun 2023 917th Herbert00709 🇵🇱 878 81 78ms 17 Nov 2023 917th HumanoidCPU 878 81 63ms 19 Feb 2024 924th rak1507 🇬🇧 877 31 33ms 20 Sep 2021 924th nwellnhof 🇩🇪 877 31 32ms 26 Sep 2021 924th Natanaelel 🇸🇪 877 31 32ms 21 Feb 2024 927th Yewzir 🇧🇪 877 55 3ms 29 Mar 2024 928th Shanethegamer 🇺🇸 877 71 447ms 25 Sep 2025 928th Yewzir 🇧🇪 877 71 445ms 2 Oct 2025 928th albanian-laundromat 877 71 423ms 25 Oct 2025 931st JayXon 🇺🇸 877 121 1,653ms 15 Sep 2025 932nd traws0 876 26 2ms 15 Jan 2022 932nd Natanaelel 🇸🇪 876 26 2ms 21 Feb 2024 934th 4hg 🇺🇸 876 45 63ms 13 Sep 2023 934th chunes3 🇺🇸 876 45 71ms 13 Sep 2023 934th Bubbler-4 876 45 71ms 13 Sep 2023 934th Steffan153 🇫🇮 876 45 70ms 13 Sep 2023 934th GolfingSuccess 🇬🇷 876 45 72ms 28 Sep 2023 934th Lydxn 🇨🇦 876 45 71ms 28 Sep 2023 934th Yewzir 🇧🇪 876 45 71ms 5 Mar 2024 941st bendiscz 876 91 266ms 16 Apr 2020 941st cywong-amino 🇭🇰 876 91 263ms 20 May 2020 941st emplv 🇱🇻 876 91 267ms 1 Oct 2020 941st Irratix 🇳🇱 876 91 275ms 18 Oct 2020 941st janbehrens 🇩🇪 876 91 273ms 22 May 2021 941st voytxt 🇨🇿 876 91 261ms 3 Feb 2023 941st kkoenig 876 91 268ms 10 Sep 2025 948th primo-ppcg 🇹🇭 875 31 2ms 1 Dec 2020 949th Yewzir 🇧🇪 875 43 2ms 19 Nov 2025 950th oparisblue 874 46 9ms 24 Mar 2019 950th mrxz 🇳🇱 874 46 8ms 23 Jun 2019 950th alexkunin 874 46 8ms 3 Jul 2019 950th EFHIII 874 46 9ms 16 Aug 2020 950th yzhs 🇩🇪 874 46 9ms 20 Aug 2020 950th hyvyys 874 46 8ms 18 Sep 2020 950th bastienvoirin 🇫🇷 874 46 9ms 28 Nov 2020 950th Re-Adventures 🇮🇳 874 46 9ms 25 Mar 2021 950th PGPereira 874 46 9ms 27 Mar 2021 950th con-cs 874 46 9ms 18 Oct 2021 950th ledietz 874 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