The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
Roman to Arabic 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 881st emgordon154 583 336 661ms 6 Nov 2025 882nd PaulTaykalo 581 170 108ms 24 Sep 2020 883rd p01 580 131 14ms 7 Feb 2018 883rd Florian-Mt 580 131 16ms 23 Oct 2023 885th CaedenHarper 🇨🇦 580 136 8ms 22 Aug 2025 886th wrhm 580 164 23ms 12 Dec 2020 886th zlee1 580 164 21ms 30 Apr 2021 886th hymanimy 580 164 22ms 8 Jan 2022 889th phdphil 579 107 271ms 22 Apr 2018 890th djeedjay 🇳🇱 577 147 3ms 6 Sep 2021 891st DanielRHolland 577 194 359ms 12 Nov 2020 892nd Bodo171 576 165 18ms 5 Dec 2022 893rd Yewzir 🇧🇪 575 139 109ms 9 Jun 2024 894th markus-rekdal 573 166 17ms 28 May 2019 894th ay2718 573 166 20ms 17 Jul 2019 894th andre-lameirinhas 🇵🇹 573 166 21ms 4 Sep 2020 894th kenny14231 573 166 18ms 5 Aug 2022 894th KiwiLT 573 166 19ms 22 Nov 2022 894th FlorianCassayre 🇫🇷 573 166 22ms 29 Jan 2023 894th AdamMorris377 573 166 18ms 7 Sep 2024 901st DaCuteRaccoon 572 133 14ms 8 Dec 2022 902nd Sciman101 572 158 6ms 16 May 2023 903rd CaedenHarper 🇨🇦 571 173 650ms 22 Aug 2025 904th BrenSchaap 569 167 19ms 21 Oct 2021 904th petroselo 569 167 18ms 29 Dec 2021 906th CaedenHarper 🇨🇦 569 181 84ms 16 Nov 2025 907th annaproxy 568 197 327ms 23 Feb 2023 908th cingulataluke 566 168 20ms 30 Aug 2023 908th RaBa21 🇭🇺 566 168 18ms 12 Jul 2025 910th Jacob385 566 181 568ms 28 Oct 2025 911th melven 566 215 42ms 16 Oct 2025 912th XenThe 🇬🇧 563 135 12ms 12 Jun 2025 913th CaedenHarper 🇨🇦 562 141 3,494ms 17 Aug 2025 914th TheAristos 562 169 20ms 1 Nov 2019 914th mishak-sys 562 169 19ms 9 Sep 2025 916th BambooleanLogic 🇸🇪 559 136 22ms 3 Nov 2022 917th itiievskyi 🇺🇦 559 170 18ms 10 Aug 2020 917th glesnick 559 170 19ms 6 Oct 2022 917th SB-945 559 170 29ms 7 Apr 2024 917th ziselsberger 559 170 28ms 7 Oct 2024 917th croc54 559 170 19ms 13 Jan 2025 922nd emgordon154 558 104 7ms 26 Jul 2024 923rd emgordon154 557 221 112ms 10 Jun 2025 924th AkashTandon167 556 171 20ms 21 Nov 2020 924th cros107 🇦🇺 556 171 26ms 14 Feb 2024 926th kkoenig 555 228 285ms 13 Sep 2024 927th amollberg 🇸🇪 553 172 26ms 16 Feb 2022 927th mbittner20 553 172 20ms 27 May 2023 927th CutSandstone 553 172 32ms 7 Jul 2024 930th uttumuttu 🇫🇮 551 138 16ms 5 Jan 2022 930th KaleChips22 551 138 13ms 3 Aug 2025 932nd Waffle3z 549 105 76ms 22 Jan 2021 933rd ludwig-n 549 173 20ms 4 Apr 2020 933rd CodeAltF4 549 173 20ms 8 Mar 2022 933rd myleopard 549 173 19ms 23 Dec 2022 936th ShiraJoseph 🇺🇸 547 139 16ms 25 Jun 2023 937th HumanoidCPU 547 144 694ms 7 Jun 2024 938th UnderKoen 🇳🇱 547 225 117ms 8 Jul 2024 939th ehulinsky 🇺🇸 546 174 20ms 8 May 2023 939th keelimeguy 🇺🇸 546 174 23ms 17 May 2025 939th Code-Coder-coder 546 174 20ms 12 Oct 2025 942nd mckymsh 543 140 14ms 1 Mar 2022 943rd IISResetMe 542 112 792ms 8 Mar 2024 943rd CaedenHarper 🇨🇦 542 112 317ms 22 Aug 2025 945th andrewteske 540 176 23ms 28 Nov 2021 945th sciencejiho 540 176 17ms 26 Sep 2024 947th olivermrose 🇺🇸 539 107 111ms 24 Oct 2021 948th nephila-nacrea 🇬🇧 537 108 26ms 17 Jan 2018 949th Pale-Vessel 537 177 22ms 18 Dec 2023 950th blaztoma 🇱🇹 535 174 191ms 9 Nov 2025 951st hrrs01 534 108 54ms 29 Jan 2018 952nd lrustand 534 178 21ms 15 Jan 2018 952nd alangodfrey 534 178 22ms 7 Feb 2019 952nd richard-oelze 🇩🇪 534 178 21ms 7 Mar 2021 952nd robin-scragg 534 178 20ms 24 Aug 2025 956th albanian-laundromat 533 122 1,066ms 13 Nov 2025 957th xkacer 🇨🇿 532 143 15ms 25 Jan 2021 957th trinityy-7 532 143 15ms 17 Mar 2024 959th elgan65536 532 214 189ms 27 Mar 2024 960th Bonjour27891 🇻🇳 531 179 20ms 15 Mar 2022 First Prev 881–960 of 1,458 Next Last