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 641st snoozingnewt 🇨🇦 709 111 611ms 9 days ago 642nd relet 709 134 20ms 8 Aug 2018 642nd melven 709 134 21ms 16 Oct 2025 642nd JOrE20 🇺🇸 709 134 567ms 19 Nov 2025 645th user189032 708 158 296ms 30 May 2019 646th Yewzir 🇧🇪 707 172 44ms 9 Jun 2024 647th SirBogman 🇺🇸 706 86 3,551ms 11 Apr 2024 647th ovs-code 🇩🇪 706 86 20ms 4 Oct 2024 649th Shanethegamer 🇺🇸 706 114 351ms 31 Oct 2023 650th Shanethegamer 🇺🇸 705 146 3,285ms 9 Jan 2022 650th Yewzir 🇧🇪 705 146 62ms 10 Jun 2024 652nd HETHAT 🇩🇿 704 135 20ms 22 Mar 2021 653rd strout 703 159 331ms 14 Dec 2023 654th andersk 🇺🇸 703 162 150ms 18 Mar 2020 655th lynn 700 117 71ms 30 Nov 2021 656th Waffle3z 700 129 22ms 17 Apr 2022 656th CaedenHarper 🇨🇦 700 129 5ms 22 Aug 2025 658th jarekwg 699 136 20ms 2 Oct 2020 658th OCNeve 699 136 18ms 18 Jun 2024 658th minhtrancccp 699 136 19ms 25 Nov 2024 658th luuumine 🇫🇷 699 136 21ms 17 Oct 2025 662nd CaedenHarper 🇨🇦 699 160 255ms 22 Aug 2025 663rd stefangimmillaro 698 113 7ms 7 Nov 2023 664th jake-freeman 697 109 14ms 13 May 2020 664th ArmaanAS 697 109 14ms 7 Mar 2021 664th voytxt 🇨🇿 697 109 17ms 12 Jul 2024 667th primo-ppcg 🇹🇭 697 147 628ms 1 Jun 2020 668th retrohun 695 114 2,371ms 16 Aug 2025 669th jared-hughes 694 64 43ms 17 Apr 2022 670th sean-niemann 🇺🇸 694 122 3ms 31 Oct 2023 671st Yewzir 🇧🇪 694 134 390ms 15 Nov 2025 672nd yzhs 🇩🇪 694 137 22ms 15 Mar 2020 672nd suwat513 694 137 40ms 15 Sep 2022 672nd neihousaigaai 694 137 20ms 6 Oct 2024 675th Yewzir 🇧🇪 693 135 10ms 9 Jun 2024 676th helbling 🇨🇭 691 110 21ms 3 Sep 2025 676th Lv0Sys 🇵🇱 691 110 13ms 22 days ago 678th yzhs 🇩🇪 690 162 298ms 25 Jul 2021 679th SnowballSH 689 138 26ms 3 Feb 2021 680th annaproxy 689 159 30ms 11 May 2023 681st CaedenHarper 🇨🇦 688 117 150ms 17 Aug 2025 682nd CaedenHarper 🇨🇦 688 136 11ms 22 Aug 2025 683rd Stockoh 🇫🇷 684 139 34ms 27 Feb 2024 683rd zhaohm14 684 139 19ms 10 Jun 2025 685th AlephSquirrel 683 55 4ms 8 Nov 2025 686th MeWhenI 🇻🇦 680 147 45ms 17 Feb 2023 687th MahlerFive 🇨🇦 680 186 328ms 24 Apr 2020 688th mintypython 679 112 13ms 16 Oct 2018 688th saramaebee 679 112 14ms 18 Oct 2018 688th igmcdowell 679 112 14ms 4 Jan 2022 691st Jiramide 679 133 14ms 7 Feb 2021 692nd KasperKivimaeki 🇫🇮 679 137 387ms 7 Nov 2025 693rd kevinmchung 679 140 26ms 3 Apr 2018 694th commandblockguy 🇺🇸 678 116 490ms 1 Sep 2025 695th ReidZ3 🇺🇸 678 165 319ms 13 Dec 2020 696th rifatx 674 141 29ms 16 Mar 2023 696th quimey 674 141 20ms 20 Jul 2023 698th KatieLG 🇬🇧 673 71 51ms 27 Nov 2023 699th vmcnabb 🇳🇿 673 113 13ms 6 May 2021 699th targrik 673 113 13ms 24 Feb 2025 701st sean-niemann 🇺🇸 673 153 87ms 11 Jul 2024 702nd MichalMarsalek 🇨🇿 672 135 360ms 30 Aug 2022 703rd Natanaelel 🇸🇪 670 167 305ms 10 May 2025 704th MeWhenI 🇻🇦 670 271 150ms 29 Nov 2023 705th lionbryce 669 135 12ms 8 Aug 2024 706th dokutan 669 138 148ms 13 Nov 2025 707th Haksell 🇦🇶 669 142 20ms 13 Jun 2020 707th btjones0 669 142 22ms 16 Jul 2022 707th Fishron 669 142 18ms 19 Sep 2022 707th jatloe 669 142 18ms 6 Sep 2024 711th dokutan 668 134 21ms 22 Jun 2024 712th SirBogman 🇺🇸 668 182 43ms 17 Apr 2022 713th NewDefectus 🇮🇱 667 87 20ms 16 Oct 2021 713th Natanaelel 🇸🇪 667 87 7ms 16 Nov 2021 713th scpchicken 🇵🇼 667 87 18ms 24 Nov 2022 716th alexkunin 667 114 14ms 7 Jul 2019 717th janbehrens 🇩🇪 665 121 358ms 16 May 2023 718th Brianzhengca 665 143 19ms 5 Feb 2021 718th TobyBoyne 🇬🇧 665 143 19ms 14 Apr 2022 720th Shanethegamer 🇺🇸 662 128 4ms 13 Jun 2022 First Prev 641–720 of 1,455 Next Last