The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
Arabic to Roman 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 801st Yewzir 🇧🇪 645 165 174ms 13 Sep 2023 802nd rowboat1 645 187 26ms 3 Apr 2021 802nd rschwa6308 🇺🇸 645 187 59ms 18 Aug 2023 802nd albanian-laundromat 645 187 20ms 24 Apr 2025 802nd bogosorter 645 187 38ms 11 Jul 2025 802nd celiendonze 🇨🇭 645 187 22ms 7 Nov 2025 807th nsprd 645 209 428ms 19 Jan 2024 808th MeWhenI 🇻🇦 643 159 10ms 25 Aug 2023 809th mamamia5x 642 143 15ms 8 Mar 2024 810th Yewzir 🇧🇪 642 162 717ms 21 Feb 2024 810th dokutan 642 162 471ms 8 Sep 2025 812th kevinmchung 642 188 38ms 2 Feb 2018 812th jhfranklin 🇬🇧 642 188 25ms 7 Mar 2021 812th ehulinsky 🇺🇸 642 188 21ms 8 May 2023 812th eiburns 642 188 19ms 3 Oct 2023 812th Just4FunCoder 642 188 38ms 18 Jun 2025 817th mtirado1 641 200 6ms 25 Dec 2022 818th ay2718 639 189 28ms 14 Aug 2019 818th Kloppermand 🇩🇰 639 189 23ms 10 Jun 2020 818th martinnorling 🇸🇪 639 189 22ms 3 Mar 2022 818th ThijsLuttikhuis 639 189 26ms 3 Mar 2024 818th tri1212 🇻🇳 639 189 557ms 30 Jun 2024 818th emgordon154 639 189 31ms 24 Sep 2024 818th Mathrew2012 639 189 19ms 24 May 2025 825th jared-hughes 639 211 510ms 24 Jun 2022 826th kkoenig 639 244 292ms 30 Dec 2023 827th JGDoerrer 639 257 185ms 15 Feb 2022 828th Waffle3z 638 128 80ms 17 Jan 2021 828th hugolgst 638 128 44ms 4 Jun 2021 830th FireyFly 637 144 17ms 14 Apr 2018 830th KrausRaus 🇺🇸 637 144 18ms 23 Oct 2020 830th didion0 🇺🇸 637 144 13ms 22 Apr 2021 830th NewDefectus 🇮🇱 637 144 15ms 8 Oct 2021 830th raphaelimahorn 637 144 13ms 26 Oct 2022 835th emplv 🇱🇻 636 245 319ms 29 Apr 2024 836th LogicalJoe 635 190 34ms 24 May 2023 836th moustave 635 190 32ms 7 Apr 2025 838th Babafaba 634 164 496ms 25 days ago 839th KatieLG 🇬🇧 633 143 1,107ms 17 Nov 2023 840th emgordon154 632 181 3,952ms 9 Aug 2025 841st garrisonhh 632 191 22ms 21 Nov 2020 841st geofft 632 191 42ms 10 Dec 2020 841st CedricGebistorf 632 191 19ms 18 Feb 2022 841st Educorreia932 632 191 24ms 23 Jun 2022 841st Ripick 632 191 25ms 6 May 2023 841st anarconic 632 191 490ms 14 Dec 2023 841st jeff-re 632 191 20ms 6 May 2025 848th emgordon154 631 152 143ms 15 Nov 2024 849th albanian-laundromat 631 227 12ms 14 Jul 2025 850th MeWhenI 🇻🇦 630 169 175ms 16 Nov 2022 851st Haksell 🇦🇶 629 130 48ms 5 Apr 2020 851st Natanaelel 🇸🇪 629 130 64ms 7 May 2025 853rd hellwue 629 192 22ms 22 Nov 2023 853rd ballaire 629 192 40ms 27 Jan 2024 855th okaponta 629 261 185ms 13 Jan 2024 856th albanian-laundromat 628 141 1,226ms 26 days ago 857th legrottagliegionata 628 146 14ms 7 Dec 2021 858th MarcMush 🇫🇷 627 144 935ms 11 Jan 2024 859th chris124567 626 249 315ms 21 Apr 2021 860th edsrzf 🇳🇿 625 64 155ms 3 Feb 2025 861st evanrittner 625 193 24ms 9 Mar 2019 861st argusdusty 🇺🇸 625 193 35ms 31 Dec 2020 861st Bonjour27891 🇻🇳 625 193 39ms 13 Mar 2022 861st AtengChen 625 193 23ms 16 Aug 2024 861st JunkIce 625 193 23ms 4 Nov 2024 866th Phil-RGOMEGA 625 205 8ms 2 Jun 2023 867th dokutan 624 142 1,414ms 8 Sep 2025 868th xyangst 624 147 13ms 26 Sep 2024 869th MeWhenI 🇻🇦 623 199 825ms 27 Jul 2024 870th Shanethegamer 🇺🇸 622 172 14ms 5 Oct 2024 871st Psirving 622 194 25ms 31 Jul 2020 871st j-Ewan 622 194 22ms 14 Feb 2022 871st Dandandooo 622 194 19ms 19 Apr 2025 874th dokutan 621 233 577ms 24 Sep 2025 875th daniel-pedersen 🇸🇪 620 148 17ms 6 Mar 2022 875th stop-amertime 620 148 15ms 5 Dec 2022 877th P-Quentin 🇫🇷 619 195 31ms 5 Aug 2022 877th BREMAUCY 🇫🇷 619 195 22ms 4 Feb 2023 877th cros107 🇦🇺 619 195 25ms 7 Jun 2023 877th m42km 619 195 22ms 14 Jan 2024 First Prev 801–880 of 1,865 Next Last