The Calendar hole will go live in approximately 34 hours. Why not try and solve it ahead of time?
Diamonds in Python 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 400th resoNathan 432 155 10ms 3 May 2024 402nd MathieuIko 429 156 10ms 20 Feb 2022 402nd P-Quentin 🇫🇷 429 156 9ms 11 Aug 2022 402nd ThatAlo 429 156 9ms 20 May 2023 405th adesanjo 427 157 9ms 24 Oct 2019 405th 4ndyJ 🇬🇧 427 157 10ms 15 Nov 2024 407th hymanimy 424 158 9ms 28 Jul 2021 407th dillon-duncando 424 158 9ms 5 Oct 2022 407th n0es 424 158 13ms 12 Oct 2022 407th bobbysq 424 158 12ms 30 Jun 2023 407th codingisgreatbutiamnot 424 158 10ms 7 Aug 2024 412th kyleclaassen 421 159 10ms 12 Mar 2022 412th Ripick 421 159 10ms 6 May 2023 412th jmatko 421 159 10ms 28 Oct 2023 415th CutSandstone 416 161 10ms 5 Jul 2024 415th LordSir101 416 161 9ms 16 Aug 2025 417th mjecke 414 162 9ms 3 Jul 2023 418th nulzo 411 163 10ms 17 Oct 2025 419th xbxbxb007 409 164 9ms 10 Jan 2024 419th azure-blondon 409 164 10ms 10 Feb 2024 419th psaban 409 164 9ms 31 Jul 2025 422nd sli-Lut 406 165 9ms 27 Oct 2023 423rd j21marshall 404 166 10ms 7 Aug 2020 423rd kronosgreen 404 166 9ms 17 Jul 2023 425th xkacer 🇨🇿 401 167 9ms 31 Jan 2021 425th tston529 401 167 9ms 25 Feb 2022 425th Fanrco 401 167 10ms 31 Aug 2023 428th oAsAo 399 168 10ms 20 Jan 2020 428th eshilo-draper 399 168 9ms 7 Oct 2022 428th Ythaenagor 399 168 10ms 5 Aug 2024 431st ABC00012345 396 169 10ms 2 May 2024 432nd b4dpxl 394 170 10ms 11 Nov 2021 432nd andrewgopher 394 170 10ms 27 Jun 2022 434th pavi2410 392 171 9ms 26 Aug 2020 435th leon-w 387 173 10ms 12 Jul 2019 435th hyvyys 387 173 10ms 13 Sep 2020 435th johnnythedoggie 387 173 10ms 29 Apr 2021 435th qwjhvbxi 387 173 9ms 5 Feb 2024 439th jydiw 385 174 9ms 14 Dec 2019 439th benradclyffe 385 174 11ms 15 May 2023 439th dokutan 385 174 10ms 20 Jun 2024 439th kbeat 🇰🇿 385 174 10ms 21 May 2025 439th TheZwierzLF 🇵🇱 385 174 10ms 9 days ago 444th jazzcurio 383 175 10ms 24 Jul 2024 444th tejapvk 383 175 9ms 18 Jun 2025 446th hiichbindermax 381 176 9ms 12 Feb 2025 447th DrPrettyman 379 177 10ms 26 Jun 2023 448th GeneralTwi 376 178 10ms 4 May 2022 448th DrJoWe 376 178 10ms 30 Apr 2024 450th kypi 374 179 9ms 21 Feb 2020 450th Mikey-Beep 🇬🇧 374 179 10ms 1 Jul 2022 450th Upload-and-View 🇺🇦 374 179 9ms 16 Aug 2025 453rd raywinray 372 180 9ms 28 Sep 2018 453rd bastienvoirin 🇫🇷 372 180 10ms 4 Apr 2020 453rd goGuru 372 180 9ms 14 Dec 2022 453rd LuisGoncalves05 🇵🇹 372 180 10ms 9 Jul 2025 453rd CoolBvll 372 180 10ms 10 Jul 2025 458th PotatoSaladOverlord 368 182 9ms 19 Jan 2024 458th GitQuick 368 182 9ms 11 Mar 2024 460th yuchuehw 366 183 10ms 10 Jan 2024 461st estomagordo 🇳🇱 364 184 9ms 3 Aug 2019 462nd GioacchinoGT02 362 185 9ms 3 Dec 2024 463rd dylanjones92 360 186 9ms 29 Jan 2024 463rd robin-scragg 360 186 12ms 3 Oct 2025 465th HassanAliKadhem 🇧🇭 358 187 9ms 14 Jan 2022 465th trist224 🇫🇷 358 187 12ms 27 Sep 2022 465th Zach10za 358 187 10ms 2 Dec 2022 468th ADV1K 🇮🇳 356 188 10ms 25 Oct 2021 468th Bananapants22 356 188 9ms 27 Aug 2022 468th Jacob385 356 188 9ms 9 Apr 2024 471st MarshalX 🇵🇱 354 189 10ms 14 Nov 2024 471st RaBa21 🇭🇺 354 189 9ms 3 Aug 2025 473rd ShootingStar91 353 190 9ms 28 May 2019 473rd Espiobest 353 190 9ms 26 Feb 2021 473rd kenballus 353 190 9ms 17 Aug 2022 473rd Ayush-Agarwal07 353 190 10ms 5 Sep 2023 473rd erikgaal 353 190 10ms 13 Oct 2023 473rd pricemat 353 190 11ms 26 Oct 2023 473rd zwxzwxzwx21 353 190 9ms 30 Jan 2024 473rd CyberTapir 353 190 10ms 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