The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
Leap Years in Python in chars. 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 Chars Time Submitted 550th RussellDash332 729 59 9ms 20 Nov 2021 550th dvdlm 729 59 9ms 16 Feb 2022 550th ebendric 729 59 9ms 11 Jun 2022 550th juan-cazalvilla 729 59 9ms 26 Jun 2022 550th try-except-try-accept 🇹🇭 729 59 10ms 26 Jun 2022 550th dwahdany 729 59 9ms 14 Jul 2022 550th eddvrs 729 59 9ms 21 Aug 2022 550th Bananapants22 729 59 10ms 1 Sep 2022 550th andre-de-lorde 729 59 16ms 7 Sep 2022 550th jhpaques 🇫🇷 729 59 9ms 19 Oct 2022 550th emirps 729 59 9ms 27 Jan 2023 550th dzshn 729 59 9ms 7 Feb 2023 550th AZ9tumas 729 59 16ms 9 Feb 2023 550th pythonNoobOz 729 59 9ms 20 Apr 2023 550th mbittner20 729 59 9ms 27 May 2023 550th Ty-Cyr 729 59 9ms 14 Jul 2023 550th jwonagel 729 59 9ms 25 Sep 2023 550th Florian-Mt 729 59 16ms 29 Sep 2023 550th gussy420 729 59 15ms 26 Oct 2023 550th NickTheEASDude 🇺🇸 729 59 33ms 15 Nov 2023 550th mstang107 729 59 16ms 20 Dec 2023 550th dylanjones92 729 59 10ms 26 Jan 2024 550th Dropbearboy 729 59 9ms 6 Sep 2024 550th hydrogencitrus 729 59 10ms 22 Sep 2024 550th JunkIce 729 59 16ms 24 Nov 2024 550th yokasuretsu 729 59 9ms 2 Jan 2025 550th IsaacAlexBarden 729 59 15ms 10 Feb 2025 550th robin-scragg 729 59 10ms 22 May 2025 550th hippopotam00sehead 🇨🇦 729 59 10ms 18 Jun 2025 590th danwley 717 60 10ms 2 Jan 2019 590th ionutm82 717 60 9ms 28 Feb 2019 590th decorator-factory 717 60 12ms 17 May 2019 590th alangodfrey 717 60 10ms 18 Jun 2019 590th AgathokakologicalBit 717 60 15ms 24 Jul 2019 590th cooldreamer 717 60 15ms 27 Aug 2019 590th GodEmperorCaterpie 717 60 16ms 4 Sep 2019 590th sambirnbaum1 717 60 10ms 7 Sep 2019 590th austinrwarner 717 60 15ms 14 Sep 2019 590th Reyzartz 717 60 9ms 16 Feb 2020 590th rplnt 717 60 17ms 16 Apr 2020 590th Jviscus1 717 60 19ms 24 Apr 2020 590th Secozzi 717 60 24ms 24 Aug 2020 590th slopey112 717 60 9ms 11 Nov 2020 590th silkyshin 717 60 9ms 22 Jan 2021 590th Cloakless 🇬🇧 717 60 10ms 17 Oct 2021 590th sbr075 717 60 15ms 7 Dec 2021 590th WilliamKeating 717 60 20ms 21 Jan 2022 590th georgehulme 717 60 11ms 27 Jan 2022 590th Mortis66666 717 60 14ms 3 Jun 2022 590th FrederikHutfless 🇩🇪 717 60 9ms 12 Jan 2023 590th namcartoon06 717 60 17ms 29 Jun 2023 590th vasiliyfursov 717 60 10ms 18 Sep 2023 590th knyghty 717 60 14ms 17 Feb 2024 590th sheeperino 🇮🇹 717 60 9ms 12 Oct 2024 590th TheAtrossian 717 60 9ms 5 Jan 2025 590th jamesthekee 717 60 9ms 27 Jan 2025 590th saladleaf 717 60 10ms 15 May 2025 618th RyanCarrusca 705 61 9ms 21 Feb 2019 618th h0n3ycl0ud 705 61 10ms 29 Jul 2019 618th ValdeQwerty 705 61 10ms 10 Oct 2019 618th austincheng 705 61 9ms 16 Oct 2019 618th xigoi 705 61 9ms 8 Feb 2021 618th awnion 705 61 15ms 19 May 2021 618th Jaydosu 705 61 9ms 22 Oct 2021 618th LeeCamp 705 61 16ms 11 Dec 2021 618th ThePyProgrammer 705 61 9ms 15 Dec 2021 618th eiburns 705 61 9ms 16 Dec 2021 618th OppositeShark 705 61 10ms 11 Apr 2022 618th jassummisko 705 61 9ms 16 May 2022 618th AliceFord 705 61 10ms 2 Jun 2022 618th orthizar 705 61 10ms 8 Jul 2022 618th bwenstar 705 61 9ms 11 Aug 2022 618th murugan-k-0204 705 61 9ms 5 Oct 2022 618th za3k 705 61 9ms 8 Oct 2022 618th Anthony-Williams-06 705 61 32ms 1 Dec 2022 618th StronkCheese 🇺🇸 705 61 10ms 27 Jan 2023 618th Sora1248 🇩🇪 705 61 9ms 23 Feb 2023 618th midnattssol 🇸🇪 705 61 9ms 22 Sep 2023 618th PrathamMehta08 705 61 13ms 6 Dec 2023 618th anarconic 705 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