The Calendar hole will go live in approximately 13 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 549th dvdlm 729 59 9ms 16 Feb 2022 549th ebendric 729 59 9ms 11 Jun 2022 549th juan-cazalvilla 729 59 9ms 26 Jun 2022 549th try-except-try-accept 🇹🇭 729 59 10ms 26 Jun 2022 549th dwahdany 729 59 9ms 14 Jul 2022 549th eddvrs 729 59 9ms 21 Aug 2022 549th Bananapants22 729 59 10ms 1 Sep 2022 549th andre-de-lorde 729 59 16ms 7 Sep 2022 549th jhpaques 🇫🇷 729 59 9ms 19 Oct 2022 549th emirps 729 59 9ms 27 Jan 2023 549th dzshn 729 59 9ms 7 Feb 2023 549th AZ9tumas 729 59 16ms 9 Feb 2023 549th pythonNoobOz 729 59 9ms 20 Apr 2023 549th mbittner20 729 59 9ms 27 May 2023 549th Ty-Cyr 729 59 9ms 14 Jul 2023 549th jwonagel 729 59 9ms 25 Sep 2023 549th Florian-Mt 729 59 16ms 29 Sep 2023 549th gussy420 729 59 15ms 26 Oct 2023 549th NickTheEASDude 🇺🇸 729 59 33ms 15 Nov 2023 549th mstang107 729 59 16ms 20 Dec 2023 549th dylanjones92 729 59 10ms 26 Jan 2024 549th Dropbearboy 729 59 9ms 6 Sep 2024 549th hydrogencitrus 729 59 10ms 22 Sep 2024 549th JunkIce 729 59 16ms 24 Nov 2024 549th yokasuretsu 729 59 9ms 2 Jan 2025 549th IsaacAlexBarden 729 59 15ms 10 Feb 2025 549th robin-scragg 729 59 10ms 22 May 2025 549th hippopotam00sehead 🇨🇦 729 59 10ms 18 Jun 2025 589th danwley 717 60 10ms 2 Jan 2019 589th ionutm82 717 60 9ms 28 Feb 2019 589th decorator-factory 717 60 12ms 17 May 2019 589th alangodfrey 717 60 10ms 18 Jun 2019 589th AgathokakologicalBit 717 60 15ms 24 Jul 2019 589th cooldreamer 717 60 15ms 27 Aug 2019 589th GodEmperorCaterpie 717 60 16ms 4 Sep 2019 589th sambirnbaum1 717 60 10ms 7 Sep 2019 589th austinrwarner 717 60 15ms 14 Sep 2019 589th Reyzartz 717 60 9ms 16 Feb 2020 589th rplnt 717 60 17ms 16 Apr 2020 589th Jviscus1 717 60 19ms 24 Apr 2020 589th Secozzi 717 60 24ms 24 Aug 2020 589th slopey112 717 60 9ms 11 Nov 2020 589th silkyshin 717 60 9ms 22 Jan 2021 589th Cloakless 🇬🇧 717 60 10ms 17 Oct 2021 589th sbr075 717 60 15ms 7 Dec 2021 589th WilliamKeating 717 60 20ms 21 Jan 2022 589th georgehulme 717 60 11ms 27 Jan 2022 589th Mortis66666 717 60 14ms 3 Jun 2022 589th FrederikHutfless 🇩🇪 717 60 9ms 12 Jan 2023 589th namcartoon06 717 60 17ms 29 Jun 2023 589th vasiliyfursov 717 60 10ms 18 Sep 2023 589th knyghty 717 60 14ms 17 Feb 2024 589th sheeperino 🇮🇹 717 60 9ms 12 Oct 2024 589th TheAtrossian 717 60 9ms 5 Jan 2025 589th jamesthekee 717 60 9ms 27 Jan 2025 589th saladleaf 717 60 10ms 15 May 2025 617th RyanCarrusca 705 61 9ms 21 Feb 2019 617th h0n3ycl0ud 705 61 10ms 29 Jul 2019 617th ValdeQwerty 705 61 10ms 10 Oct 2019 617th austincheng 705 61 9ms 16 Oct 2019 617th xigoi 705 61 9ms 8 Feb 2021 617th awnion 705 61 15ms 19 May 2021 617th Jaydosu 705 61 9ms 22 Oct 2021 617th LeeCamp 705 61 16ms 11 Dec 2021 617th ThePyProgrammer 705 61 9ms 15 Dec 2021 617th eiburns 705 61 9ms 16 Dec 2021 617th OppositeShark 705 61 10ms 11 Apr 2022 617th jassummisko 705 61 9ms 16 May 2022 617th AliceFord 705 61 10ms 2 Jun 2022 617th orthizar 705 61 10ms 8 Jul 2022 617th bwenstar 705 61 9ms 11 Aug 2022 617th murugan-k-0204 705 61 9ms 5 Oct 2022 617th za3k 705 61 9ms 8 Oct 2022 617th Anthony-Williams-06 705 61 32ms 1 Dec 2022 617th StronkCheese 🇺🇸 705 61 10ms 27 Jan 2023 617th Sora1248 🇩🇪 705 61 9ms 23 Feb 2023 617th midnattssol 🇸🇪 705 61 9ms 22 Sep 2023 617th PrathamMehta08 705 61 13ms 6 Dec 2023 617th anarconic 705 61 16ms 8 Dec 2023 617th brimstonetrader 705 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