The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Leap Years in Python 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 370th AodhanDalton 782 55 16ms 2 Sep 2022 370th TimLeffke 782 55 15ms 13 Sep 2022 370th LogicalJoe 782 55 9ms 31 Oct 2022 370th nstearns96 🇬🇧 782 55 20ms 2 Jan 2023 370th M0PKOBKA 782 55 10ms 9 Jan 2023 370th ssbhatt4321 782 55 16ms 11 Jun 2023 370th msbranicky 782 55 9ms 6 Jul 2023 370th 2011-Chan-Ethan 782 55 15ms 12 Jul 2023 370th mikehanus 782 55 9ms 22 Nov 2023 370th kurkale6ka 782 55 16ms 29 Dec 2023 370th Masttest 782 55 9ms 17 Feb 2024 370th HumanoidCPU 782 55 9ms 19 Feb 2024 370th Jacob385 782 55 9ms 3 Apr 2024 370th deerawj 782 55 15ms 7 Apr 2024 370th PyryL 🇫🇮 782 55 11ms 22 Aug 2024 370th Deedogg 782 55 16ms 5 Sep 2024 370th NanduBC 782 55 9ms 7 Sep 2024 370th Mabeloid 🇳🇴 782 55 9ms 21 Sep 2024 370th thienudomsrirungruang 782 55 16ms 17 Nov 2024 370th CodyKlingler 782 55 16ms 20 Jan 2025 370th 0xjac 🇨🇭 782 55 17ms 9 Jun 2025 370th xDragoxboi 782 55 15ms 6 Jul 2025 370th SectorCorruptor 782 55 16ms 14 Aug 2025 370th iliaspapa 782 55 16ms 7 days ago 425th endlessnumbers 768 56 10ms 10 Jan 2019 425th Sakaala 768 56 10ms 23 Apr 2019 425th aaay-aaay 768 56 9ms 2 Jun 2019 425th bernardgardner 768 56 17ms 9 Jul 2019 425th petar-donchev 768 56 16ms 27 Aug 2019 425th mogron 768 56 30ms 13 Dec 2019 425th laserb 768 56 13ms 25 Jan 2020 425th itiievskyi 🇺🇦 768 56 16ms 2 Aug 2020 425th QuinnQR 768 56 9ms 18 Aug 2020 425th mauro-1 🇮🇹 768 56 16ms 18 Oct 2020 425th mothcolada 🇺🇸 768 56 16ms 14 Jan 2021 425th UBKorkut 768 56 9ms 12 Mar 2021 425th jhunterkohler 768 56 9ms 20 May 2021 425th kinoute 🇫🇷 768 56 17ms 10 Sep 2021 425th Evan-Robotics 768 56 16ms 31 Jan 2022 425th TheSmilingTurtle 768 56 16ms 19 May 2022 425th Poisoncrxss 768 56 9ms 21 Jun 2022 425th galloj 🇨🇿 768 56 11ms 31 Aug 2022 425th jazztext 768 56 9ms 1 Jan 2023 425th kimbo 🇺🇸 768 56 10ms 4 Jan 2023 425th Edjyzod 768 56 16ms 7 Mar 2023 425th CheeseCake628 🇳🇴 768 56 9ms 19 Mar 2023 425th ejini6969 768 56 24ms 1 Apr 2023 425th minhtrancccp 768 56 9ms 27 Sep 2023 425th m42km 768 56 16ms 11 Nov 2023 425th firegene 🇮🇪 768 56 23ms 24 Dec 2023 425th epic-programmer-guy 768 56 16ms 25 Dec 2023 425th DGipe 768 56 15ms 4 Mar 2024 425th TheZwierzLF 🇵🇱 768 56 16ms 27 May 2025 425th matejmatik123 🇸🇰 768 56 15ms 12 Jul 2025 425th addmai 768 56 10ms 25 Jul 2025 425th NeuralG 768 56 16ms 11 Sep 2025 425th jacekwladzinski 768 56 16ms 4 Oct 2025 425th ItsMeNoobieboy 768 56 9ms 21 Oct 2025 459th Sakrette 754 57 16ms 31 Dec 2018 459th ly0va 754 57 9ms 3 Jan 2019 459th danielwang5 754 57 9ms 3 Jan 2019 459th benwilliamgraham 754 57 16ms 26 Jan 2019 459th RobertVagt 754 57 9ms 26 Feb 2019 459th ieeemma 754 57 13ms 8 Jun 2019 459th cpt-John 754 57 15ms 24 Jun 2019 459th mossprescott 754 57 9ms 24 Jun 2019 459th deflatSOCO 754 57 16ms 4 Jul 2019 459th DaleNaci 754 57 9ms 9 Jul 2019 459th cellobix 754 57 13ms 14 Aug 2019 459th blashley 754 57 9ms 23 Jan 2020 459th sanssaraf 754 57 9ms 4 May 2020 459th louisbosqui 754 57 9ms 28 Dec 2020 459th peculiarination 754 57 16ms 13 May 2021 459th SniperSmiley 🇺🇸 754 57 9ms 23 Jun 2021 459th danielweper 754 57 9ms 21 Oct 2021 459th b4dpxl 754 57 16ms 11 Nov 2021 459th amollberg 🇸🇪 754 57 16ms 5 Jan 2022 459th guilhem-roy 🇫🇷 754 57 15ms 28 Feb 2022 459th pyrolitic 🇮🇪 754 57 9ms 7 Apr 2022 459th twocatsinatrenchcoat 754 57 15ms 12 May 2022 First Prev 401–480 of 1,105 Next Last