The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
PalindromemordnilaP 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 79th sean-niemann 🇺🇸 898 47 35ms 21 Dec 2024 79th Natanaelel 🇸🇪 898 47 50ms 24 Jan 2025 83rd xsot 🇸🇬 897 58 940ms 32 hours ago 84th JayXon 🇺🇸 897 69 136ms 31 Oct 2024 85th JayXon 🇺🇸 896 77 2ms 9 Jan 2025 85th GrayJoKing 🇦🇺 896 77 2ms 12 Jul 2025 85th edsrzf 🇳🇿 896 77 2ms 19 days ago 88th pardouin 🇫🇷 895 41 181ms 7 Jan 2025 89th GrayJoKing 🇦🇺 894 47 6ms 24 days ago 90th nwellnhof 🇩🇪 894 52 261ms 1 Sep 2024 91st JayXon 🇺🇸 893 99 414ms 11 Jul 2025 91st AdrienHache 🇫🇷 893 99 432ms 17 Sep 2025 91st Yax42 🇫🇷 893 99 402ms 8 Oct 2025 94th emplv 🇱🇻 891 70 6ms 17 Sep 2024 95th pardouin 🇫🇷 891 99 118ms 1 Sep 2024 95th Natanaelel 🇸🇪 891 99 116ms 1 Sep 2024 95th ovs-code 🇩🇪 891 99 120ms 1 Sep 2024 95th sean-niemann 🇺🇸 891 99 119ms 4 Sep 2024 95th JayXon 🇺🇸 891 99 117ms 6 Sep 2024 95th lynn 891 99 119ms 8 Jan 2025 95th xnor-gate 891 99 119ms 4 Mar 2025 95th Sakisan 🇧🇪 891 99 115ms 22 Apr 2025 95th tobeannouncd 891 99 133ms 25 Apr 2025 95th HPWiz 🇳🇿 891 99 117ms 27 Sep 2025 95th edsrzf 🇳🇿 891 99 173ms 17 hours ago 106th Steffan153 🇫🇮 890 86 11ms 1 Sep 2024 106th SB-945 890 86 11ms 1 Sep 2024 106th SirBogman 🇺🇸 890 86 10ms 2 Sep 2024 106th stefangimmillaro 890 86 10ms 2 Sep 2024 106th m-tkach 🇺🇦 890 86 10ms 2 Sep 2024 106th lynn 890 86 11ms 4 Sep 2024 106th emgordon154 890 86 10ms 22 Nov 2024 106th kops-cg 890 86 10ms 11 Feb 2025 106th bzijlema 🇳🇱 890 86 10ms 14 May 2025 106th 5cw 🇺🇸 890 86 10ms 4 Aug 2025 106th ovs-code 🇩🇪 890 86 10ms 20 days ago 106th hallvabo 🇳🇴 890 86 11ms 18 days ago 106th Mukundan314 890 86 11ms 18 days ago 119th JayXon 🇺🇸 890 101 2ms 18 Sep 2024 120th emgordon154 889 70 4,640ms 8 Nov 2024 121st pardouin 🇫🇷 886 59 362ms 2 Sep 2024 121st HPWiz 🇳🇿 886 59 292ms 14 days ago 123rd nwellnhof 🇩🇪 886 109 472ms 25 Sep 2025 123rd JayXon 🇺🇸 886 109 464ms 25 Sep 2025 125th btnlq 885 55 6ms 1 Sep 2024 125th ovs-code 🇩🇪 885 55 15ms 20 Oct 2024 125th sean-niemann 🇺🇸 885 55 7ms 29 Dec 2024 128th Natanaelel 🇸🇪 885 80 9ms 1 Sep 2024 128th MeWhenI 🇻🇦 885 80 8ms 1 Sep 2024 128th helbling 🇨🇭 885 80 9ms 11 Jul 2025 131st nwellnhof 🇩🇪 884 100 421ms 22 Jul 2025 132nd edsrzf 🇳🇿 881 59 957ms 47 hours ago 133rd ovs-code 🇩🇪 880 25 50ms 1 Sep 2024 134th sean-niemann 🇺🇸 880 72 484ms 14 days ago 135th GrayJoKing 🇦🇺 879 60 12ms 3 Sep 2024 135th error256 879 60 12ms 3 Sep 2024 135th edsrzf 🇳🇿 879 60 12ms 19 days ago 138th GolfingSuccess 🇬🇷 879 87 11ms 1 Sep 2024 138th kg583 🇺🇸 879 87 14ms 1 Sep 2024 138th alemelis 879 87 10ms 1 Sep 2024 138th Shanethegamer 🇺🇸 879 87 10ms 1 Sep 2024 138th zbreit 🇺🇸 879 87 10ms 1 Sep 2024 138th cros107 🇦🇺 879 87 14ms 2 Sep 2024 138th inventshah 879 87 11ms 2 Sep 2024 138th annaproxy 879 87 11ms 3 Sep 2024 138th starfihs 879 87 10ms 6 Sep 2024 138th BoBz200 879 87 10ms 20 Sep 2024 138th ehulinsky 🇺🇸 879 87 12ms 3 Apr 2025 138th chartung17 879 87 10ms 7 Apr 2025 138th 40fied4t 879 87 10ms 6 May 2025 138th ryyyn 🇺🇸 879 87 11ms 10 Jun 2025 138th commandblockguy 🇺🇸 879 87 11ms 11 Jul 2025 138th hiichbindermax 879 87 10ms 19 Aug 2025 138th Babafaba 879 87 10ms 22 Oct 2025 155th radarek 🇵🇱 878 52 864ms 10 Sep 2024 156th IanUtley 877 78 14ms 1 Sep 2024 156th kops-cg 877 78 14ms 6 Mar 2025 158th JayXon 🇺🇸 876 71 3,940ms 8 Nov 2024 158th pardouin 🇫🇷 876 71 4,777ms 17 Nov 2024 160th JayXon 🇺🇸 876 122 534ms 18 Sep 2024 First Prev 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