The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
All holes in C 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 716th Kacarott 🇦🇺 1 979 47 29 Aug 2024 716th cefqrn 1 979 47 17 Nov 2025 723rd cgjohannsen 2 975 226 12 Jun 2022 724th lowkey42 1 973 74 3 Jan 2022 725th grbnshchkv 1 960 75 16 Jun 2019 725th qwertybomb 1 960 75 24 Apr 2020 725th yunapotamus 1 960 75 26 Apr 2020 725th adeepak7 🇮🇳 1 960 75 27 May 2020 725th felixlienaldi 1 960 75 8 Jun 2020 725th sushicombo 1 960 75 8 Jun 2020 725th wendao2000 1 960 75 8 Jun 2020 725th p4plus2 1 960 75 4 Nov 2020 725th btjones0 1 960 75 25 Dec 2020 725th s-cs-s 1 960 75 16 Sep 2021 725th gerschdn 1 960 75 18 Jan 2022 725th yevhenii-sharlaimov 1 960 75 11 Oct 2022 725th madexTest 1 960 75 12 Nov 2022 725th abduelhamit 1 960 75 12 Nov 2022 725th ivan-on-github 1 960 75 22 Sep 2023 725th smugiss 1 960 75 12 Dec 2023 725th dylanarmstrong 1 960 75 23 Jan 2024 725th BoundlessCarrot 1 960 75 20 Apr 2024 725th christian0919 1 960 75 25 Jun 2024 725th souta-1326 1 960 75 1 Apr 2025 745th willpiam 2 960 228 16 Oct 2023 746th Yooser0 2 960 480 29 Mar 2024 747th Florian-Mt 2 959 223 14 Jul 2024 748th Parma-Jon 1 958 48 20 Mar 2023 748th cesarm4 1 958 48 5 May 2023 748th ihebu 🇹🇳 1 958 48 20 Dec 2023 748th Languag3 1 958 48 45 hours ago 752nd Rowdydangerous 3 958 567 22 Feb 2021 753rd phpboyscout 2 952 262 26 May 2021 754th lukalotl 2 950 279 30 May 2021 755th jeff-at-tamer-dot-codes 🇺🇸 2 947 550 26 Aug 2023 756th mdnestor 2 945 608 10 Jun 2024 757th NatNgs 2 944 240 9 Jan 2020 758th Stanbroek 3 944 943 19 Sep 2023 759th jacklynnepenick 2 941 214 30 Aug 2021 759th AZ9tumas 2 941 214 15 Nov 2022 761st DavidSkrundz 1 939 49 25 Jan 2020 761st JuhoHeiskanen 1 939 49 19 Feb 2020 761st nairda1705 1 939 49 16 Oct 2020 761st oceko 1 939 49 13 Feb 2024 765th lemmaandrew 2 936 210 23 Jan 2021 766th 4ndyJ 🇬🇧 2 936 236 17 Dec 2022 767th RDmit 1 935 77 19 Dec 2022 768th OttscoMC 2 935 270 18 Jun 2021 769th MID246 2 934 255 14 Nov 2024 770th cyanbun96 2 924 340 23 Sep 2025 771st olleicua 🇺🇸 3 924 1,411 9 Nov 2025 772nd adityaghosh2264 1 923 78 6 days ago 773rd jadequin 3 923 773 21 Mar 2022 774th kittrz9 4 923 2,325 19 Jul 2019 775th paralysedforce 1 920 50 6 Dec 2020 775th Hecate2 1 920 50 26 Oct 2021 775th yzkonchain 1 920 50 26 Oct 2021 775th kskjer 1 920 50 12 Jun 2022 775th Emsa001 1 920 50 18 May 2024 780th nantf 2 918 241 13 Mar 2021 781st peachtao22 2 915 2,145 1 Apr 2025 782nd ccbrown 1 914 93 20 Apr 2020 783rd dymowski 2 912 1,088 14 Jul 2019 784th viv511 3 912 1,559 7 Feb 2025 785th cros107 🇦🇺 2 906 273 16 Oct 2024 786th mothcolada 🇺🇸 7 906 7,175 1 Apr 2021 787th croc54 2 904 405 9 Jan 2025 788th atakan-se 1 902 51 24 Sep 2020 788th jeremy-murphy 1 902 51 20 Mar 2021 788th olishenton 1 902 51 17 Feb 2023 788th Tavress 1 902 51 11 May 2023 788th sona-tau 1 902 51 26 Aug 2023 788th Kesefon 1 902 51 24 Oct 2023 788th 0scarB 1 902 51 15 Jun 2024 788th hrrs01 1 902 51 20 Aug 2024 796th SoraTenshi 🇩🇪 1 900 80 28 Apr 2023 797th barbu110 2 893 220 5 Dec 2019 798th bendiscz 1 891 55 21 Apr 2020 798th nathanadams 🇳🇿 1 891 55 11 Apr 2021 800th MichalMarsalek 🇨🇿 2 891 1,160 18 Aug 2022 First Prev 721–800 of 1,499 Next Last