The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
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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 561st MeWhenI 🇻🇦 587 109 47ms 12 Nov 2022 562nd Indivicivet 587 123 20ms 24 Oct 2021 562nd nullie 587 123 12ms 5 Jun 2022 562nd aalec 587 123 10ms 4 May 2024 565th elisherer 🇮🇱 587 139 11ms 28 Sep 2021 565th pineapplebox 587 139 11ms 23 Mar 2022 565th CatsAreFluffy 587 139 11ms 30 Dec 2022 568th Yewzir 🇧🇪 586 153 3ms 19 Nov 2025 569th annaproxy 584 198 14ms 29 Nov 2022 570th moikaturns 🇬🇧 583 140 11ms 26 Aug 2022 570th BBoehm 🇩🇪 583 140 11ms 30 Jan 2024 570th madeforlosers 583 140 11ms 5 Mar 2025 573rd btjones0 582 124 13ms 15 Jul 2022 573rd tri1212 🇻🇳 582 124 14ms 3 Jun 2024 573rd HumanoidCPU 582 124 10ms 31 Oct 2024 576th MeWhenI 🇻🇦 582 423 12ms 28 Aug 2023 577th dokutan 579 130 1,565ms 21 Sep 2025 578th Protothor 579 141 11ms 29 May 2025 579th edsrzf 🇳🇿 579 221 7ms 9 days ago 580th knutae 🇳🇴 578 125 11ms 29 Oct 2021 580th RDShah 578 125 11ms 8 Jun 2022 580th inverseLorentz 🇦🇺 578 125 11ms 25 Jun 2022 580th myleopard 578 125 11ms 20 Jul 2022 580th betaveros 578 125 12ms 30 Dec 2022 580th janbehrens 🇩🇪 578 125 12ms 10 Jul 2023 580th jmerle 🇳🇱 578 125 13ms 17 Jul 2023 580th bzijlema 🇳🇱 578 125 11ms 20 Sep 2023 580th FranklinJiaChen 578 125 10ms 12 Jun 2024 580th firegene 🇮🇪 578 125 10ms 5 Aug 2024 580th Bulmenisaurus 578 125 13ms 11 Aug 2024 580th JunkIce 578 125 10ms 24 Nov 2024 580th yokasuretsu 578 125 10ms 4 Jan 2025 580th RobertHoeh 578 125 10ms 3 Mar 2025 580th katss2 578 125 10ms 14 Aug 2025 580th CommandLeo 🇮🇹 578 125 12ms 25 days ago 596th ovs-code 🇩🇪 577 149 96ms 5 Mar 2024 597th MeWhenI 🇻🇦 576 119 150ms 3 Aug 2024 598th Yewzir 🇧🇪 576 188 882ms 24 Sep 2025 599th janbehrens 🇩🇪 575 177 72ms 20 Nov 2022 600th Natanaelel 🇸🇪 575 257 184ms 25 Mar 2024 601st roavin 574 155 448ms 13 Jun 2022 602nd fourth-bit 573 126 17ms 1 Jul 2024 603rd HumanoidCPU 571 116 451ms 31 Oct 2024 604th CaedenHarper 🇨🇦 571 120 164ms 23 Aug 2025 605th asheeri 569 127 10ms 23 Aug 2021 605th BrenSchaap 569 127 10ms 21 Oct 2021 605th NewDefectus 🇮🇱 569 127 12ms 2 Dec 2021 605th scpchicken 🇵🇼 569 127 12ms 7 Mar 2022 605th Troon 569 127 11ms 1 Nov 2022 605th DialFrost 🇸🇬 569 127 12ms 11 Feb 2023 605th StardustGogeta 569 127 11ms 6 May 2023 605th yourlefthandman 569 127 23ms 16 Aug 2023 605th AbhilashaTandon 569 127 14ms 24 Sep 2023 605th Mabeloid 🇳🇴 569 127 10ms 7 Sep 2024 605th CaedenHarper 🇨🇦 569 127 10ms 7 Nov 2024 605th Flekay 🇩🇪 569 127 11ms 10 Jul 2025 605th wuduculfre 569 127 10ms 29 Jul 2025 605th solisolu 569 127 11ms 25 Nov 2025 605th Lv0Sys 🇵🇱 569 127 15ms 18 days ago 620th SteveHales 569 154 120ms 20 Oct 2025 621st Michiocre 567 144 11ms 20 Feb 2024 622nd cochrane 567 195 97ms 22 Mar 2024 623rd MeWhenI 🇻🇦 565 86 160ms 31 Jan 2023 624th MeWhenI 🇻🇦 565 155 4ms 13 Aug 2024 625th KatieLG 🇬🇧 565 208 4ms 7 Oct 2021 626th jacklynnepenick 564 128 11ms 28 Aug 2021 626th nstearns96 🇬🇧 564 128 11ms 22 Jan 2023 626th wuzekai518 564 128 10ms 28 Jun 2024 626th ryyyn 🇺🇸 564 128 12ms 20 Jan 2025 626th lelbal 564 128 10ms 22 Sep 2025 631st Jacob385 564 192 878ms 28 Oct 2025 632nd MiffOttah 563 145 12ms 6 Oct 2024 633rd MiffOttah 563 158 435ms 6 Oct 2024 634th mousetail 🇳🇱 562 83 3ms 13 Dec 2022 635th Yewzir 🇧🇪 562 215 348ms 3 Jan 2024 636th JunkIce 561 118 498ms 3 Dec 2024 637th snoozingnewt 🇨🇦 561 135 26ms 13 days ago 638th janbehrens 🇩🇪 561 193 669ms 10 Jul 2023 639th MeWhenI 🇻🇦 561 241 188ms 17 Feb 2022 640th jaredtrh 560 129 11ms 11 Sep 2021 First Prev 561–640 of 1,269 Next Last