The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
All holes in Rust 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 Holes Points Bytes Submitted 401st Anonymousellama21 1 853 75 11 Feb 2022 401st bknower 1 853 75 3 Jul 2025 403rd amillh 1 852 256 6 Nov 2022 404th dyc3 1 849 86 4 Aug 2020 405th Serentty 1 848 66 31 May 2020 406th undersquire 1 846 104 21 Jun 2023 406th o800 1 846 104 17 Nov 2025 408th elliottc 1 846 560 4 Jan 2020 409th acostama 1 845 561 24 Mar 2022 410th derderder77 1 842 76 4 Jan 2020 410th 0xjac 🇨🇭 1 842 76 14 Jun 2020 410th roflolilolmao 1 842 76 14 Jun 2020 410th nyoshe 1 842 76 10 Oct 2023 410th mathisfun271 1 842 76 21 Feb 2024 410th wh3n3v3r 🇨🇿 1 842 76 15 Nov 2024 410th Andrey2001 1 842 76 27 days ago 417th Zounon 2 840 5,261 7 Sep 2025 418th davbass 🇮🇹 1 839 87 3 Sep 2024 419th pickerj 1 837 566 7 Aug 2024 420th erics118 1 836 67 13 May 2022 420th Flying-Toast 1 836 67 24 May 2024 422nd Secozzi 1 832 113 4 Nov 2020 422nd Banzobotic 1 832 113 7 Mar 2024 424th CollinWeyel 1 829 70 22 Dec 2023 425th AxelMontini 1 825 114 5 Jan 2020 425th AgentIvan 🇺🇦 1 825 114 25 Mar 2021 425th alomiF 1 825 114 28 Aug 2023 425th byronknoll 🇺🇸 1 825 114 17 May 2024 425th yupiel 1 825 114 8 Jan 2025 425th raceoffer 1 825 114 16 Jul 2025 431st dteague3989 1 824 68 26 May 2023 432nd CSRessel 1 822 174 13 Sep 2025 433rd AnnoyedArt1256 1 821 78 23 Jan 2022 433rd MichaelMBradley 🇨🇦 1 821 78 21 Jul 2022 433rd raphaelimahorn 1 821 78 3 Oct 2022 433rd Sciman101 1 821 78 15 May 2023 433rd Just4FunCoder 1 821 78 26 Aug 2024 433rd jacekwladzinski 1 821 78 2 Oct 2025 439th komunre 3 821 4,599 25 Mar 2025 440th Spadi0 1 820 578 2 Jan 2022 441st HazeSystem 2 819 543 18 Jan 2023 442nd Ralgun 1 817 115 28 Aug 2023 443rd JOrE20 🇺🇸 3 813 3,098 5 days ago 444th p-vf 🇨🇭 1 812 69 25 Oct 2021 445th fajost 1 810 79 2 Sep 2020 445th lilyyy411 1 810 79 10 Sep 2021 445th TheRealOhead 🇺🇸 1 810 79 17 Mar 2022 445th Cloakless 🇬🇧 1 810 79 17 Feb 2023 445th desecaw13 1 810 79 24 Jan 2025 450th j-Ewan 1 810 116 18 Feb 2022 451st trvswgnr 1 808 177 29 Apr 2023 452nd Alex-Huggett 🇬🇧 1 807 109 14 Apr 2024 453rd CheeseCake628 🇳🇴 1 800 80 14 Feb 2023 454th kmathis22 1 800 110 24 Sep 2025 455th qwunchy 2 799 1,252 19 Nov 2024 456th peeveen 🇬🇧 1 793 92 10 Oct 2023 457th LiquidPulsar 1 793 116 24 Jan 2023 458th GWStuart 2 793 1,171 15 Sep 2023 459th archaephyrryx 1 790 119 21 Oct 2020 459th twocatsinatrenchcoat 1 790 119 25 Apr 2022 459th swarnimarun 1 790 119 18 May 2022 462nd august-soderberg 1 789 71 19 May 2023 463rd lambda-abstraction 1 786 112 21 Oct 2023 464th sreedevk 🇺🇸 1 785 93 4 Dec 2022 465th cafkafk 1 783 120 18 Nov 2023 466th abel465 🇳🇿 1 781 114 7 May 2021 467th Dandandooo 1 780 82 20 Apr 2025 468th annaproxy 1 778 72 14 Feb 2022 469th YoshiTheChinchilla 1 777 121 3 Feb 2020 469th ForgottenMaster 1 777 121 21 May 2021 469th Alenar 1 777 121 12 Aug 2023 472nd JustJakeee 2 777 1,227 18 May 2022 473rd Chesium 4 776 6,417 9 Aug 2020 474th jsvizcaino 1 775 612 13 Dec 2022 475th wellsie1116 1 774 115 14 Dec 2021 476th epic-programmer-guy 1 771 83 29 Dec 2023 477th nwatx 2 770 337 1 Dec 2021 478th jafioti 1 764 123 2 Dec 2022 479th bbonenfant 1 763 245 21 Nov 2020 480th charliegaming 1 762 84 4 Oct 2023 First Prev 401–480 of 740 Next Last