The Calendar hole will go live in approximately 8 days. Why not try and solve it ahead of time?
τ in all languages in chars. 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 Chars Time Submitted 321st NewDefectus 🇮🇱 851 70 10ms 11 Feb 2021 321st voytxt 🇨🇿 851 70 20ms 27 Apr 2023 321st jbt 851 70 10ms 26 Dec 2023 321st emgordon154 851 70 12ms 10 Oct 2024 325th Shanethegamer 🇺🇸 851 115 438ms 24 May 2023 325th fuzzylojik-golf 🇺🇸 851 115 421ms 2 Sep 2025 327th MeWhenI 🇻🇦 850 128 171ms 16 Nov 2022 328th sean-niemann 🇺🇸 849 163 138ms 8 Jun 2025 329th stassats 847 58 22ms 28 Apr 2018 329th Lydxn 🇨🇦 847 58 13ms 6 Jul 2022 329th AlephSquirrel 847 58 14ms 21 Jan 2025 329th DialFrost 🇸🇬 847 58 14ms 22 Jan 2025 333rd GrayJoKing 🇦🇺 846 48 90ms 15 Jun 2021 334th DialFrost 🇸🇬 844 112 110ms 23 Mar 2025 335th yzhs 🇩🇪 843 45 217ms 21 Jun 2022 336th DialFrost 🇸🇬 843 56 762ms 31 Aug 2025 337th edre 843 67 12ms 27 Apr 2018 337th ovs-code 🇩🇪 843 67 11ms 14 Jan 2023 337th AlephSquirrel 843 67 12ms 17 Aug 2023 337th zacjl 843 67 11ms 27 Apr 2025 337th KasperKivimaeki 🇫🇮 843 67 13ms 8 Jul 2025 337th 5cw 🇺🇸 843 67 13ms 12 Jul 2025 343rd Herbert00709 🇵🇱 843 140 72ms 25 Oct 2024 344th emgordon154 842 179 2,351ms 3 days ago 345th MeWhenI 🇻🇦 841 64 356ms 13 Jul 2024 346th fuzzylojik-golf 🇺🇸 839 71 12ms 2 Sep 2025 347th Kacarott 🇦🇺 837 58 491ms 13 Sep 2024 348th sean-niemann 🇺🇸 837 141 73ms 25 Jun 2025 349th JayXon 🇺🇸 837 142 502ms 24 Sep 2025 350th primo-ppcg 🇹🇭 837 157 519ms 16 Jan 2021 351st MeWhenI 🇻🇦 836 102 567ms 28 Feb 2022 351st emgordon154 836 102 503ms 25 May 2025 353rd SirBogman 🇺🇸 836 117 446ms 24 Jan 2024 354th SirBogman 🇺🇸 836 120 12ms 7 Jul 2023 355th jslip 832 59 14ms 25 May 2022 355th ovs-code 🇩🇪 832 59 18ms 11 Mar 2023 355th Steffan153 🇫🇮 832 59 15ms 12 Mar 2023 355th xsot 🇸🇬 832 59 11ms 6 Oct 2024 359th fuzzylojik-golf 🇺🇸 832 143 507ms 24 Sep 2025 360th thisishowmymindworks 🇳🇴 831 68 10ms 14 Oct 2020 360th StefanHabel 🇨🇦 831 68 17ms 14 Mar 2023 360th bizy-coder 831 68 25ms 19 Jan 2024 360th croc54 831 68 17ms 3 Dec 2024 360th Babafaba 831 68 88ms 23 Nov 2025 365th GrayJoKing 🇦🇺 831 69 88ms 27 May 2022 366th jared-hughes 831 142 95ms 7 Feb 2023 367th emplv 🇱🇻 830 114 108ms 2 Jan 2023 368th namelessiw 829 118 411ms 22 Jul 2025 369th ovs-code 🇩🇪 828 49 85ms 22 Oct 2023 370th HPWiz 🇳🇿 828 65 395ms 19 Jan 2024 370th albanian-laundromat 828 65 384ms 9 Aug 2025 372nd GrayJoKing 🇦🇺 828 143 68ms 2 Feb 2024 373rd emplv 🇱🇻 827 65 135ms 28 Mar 2025 374th DialFrost 🇸🇬 826 144 550ms 25 Sep 2025 375th Andriamanitra 🇫🇮 825 46 247ms 23 Sep 2022 375th neel11235813 825 46 271ms 14 Feb 2023 375th voytxt 🇨🇿 825 46 2,391ms 22 May 2023 375th edsrzf 🇳🇿 825 46 2,254ms 7 Sep 2025 375th Lv0Sys 🇵🇱 825 46 189ms 24 days ago 380th Shanethegamer 🇺🇸 822 115 115ms 14 Oct 2022 381st nwellnhof 🇩🇪 822 122 10ms 5 May 2020 381st sean-niemann 🇺🇸 822 122 23ms 25 Jun 2025 381st jared-hughes 822 122 33ms 23 Sep 2025 384th nwellnhof 🇩🇪 820 47 1,190ms 10 Feb 2020 384th Lydxn 🇨🇦 820 47 4,898ms 2 Aug 2023 386th sean-niemann 🇺🇸 820 145 521ms 25 Sep 2025 387th lynn 819 69 36ms 1 Dec 2021 387th fkantelberg 819 69 12ms 5 Aug 2023 387th ryyyn 🇺🇸 819 69 1,074ms 14 Nov 2025 390th SirBogman 🇺🇸 819 144 78ms 27 May 2023 391st ovs-code 🇩🇪 816 66 431ms 15 Jan 2024 391st AlephSquirrel 816 66 390ms 21 Jan 2024 393rd AlephSquirrel 816 73 10ms 10 Feb 2023 393rd KingSkyrock 🇺🇸 816 73 10ms 14 Oct 2024 395th rucin93 🇵🇱 815 66 151ms 14 Mar 2025 396th stefangimmillaro 815 120 400ms 1 Aug 2023 397th rhdqor213 815 123 21ms 27 Jun 2024 398th saito-ta 🇯🇵 814 33 403ms 4 Aug 2023 399th o0lit3 🇺🇸 813 32 34ms 6 Jan 2022 400th nwellnhof 🇩🇪 812 50 80ms 1 May 2020 First Prev 321–400 of 2,257 Next Last