The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Leap Years in Julia 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 1st JayXon 🇺🇸 1,000 35 538ms 17 Apr 2021 1st Lydxn 🇨🇦 1,000 35 504ms 22 Aug 2021 1st sean-niemann 🇺🇸 1,000 35 495ms 30 Sep 2022 1st Steffan153 🇫🇮 1,000 35 423ms 26 Dec 2022 1st DialFrost 🇸🇬 1,000 35 460ms 8 Nov 2023 6th primo-ppcg 🇹🇭 972 36 374ms 12 Oct 2020 6th HPWiz 🇳🇿 972 36 481ms 17 Nov 2020 6th antimon2 🇯🇵 972 36 445ms 25 Jan 2021 6th ovs-code 🇩🇪 972 36 498ms 24 Oct 2023 10th dokutan 946 37 379ms 18 Mar 2025 11th janbehrens 🇩🇪 921 38 371ms 1 Nov 2021 11th MeWhenI 🇻🇦 921 38 369ms 25 Nov 2022 13th ETHproductions 🇺🇸 897 39 369ms 22 Dec 2018 14th lynn 875 40 312ms 30 Jun 2021 14th MarcMush 🇫🇷 875 40 489ms 3 Dec 2021 14th sisyphus-ppcg 🇦🇺 875 40 468ms 24 Jan 2023 14th Codsilla 🇨🇦 875 40 379ms 23 Mar 2023 18th voytxt 🇨🇿 854 41 385ms 11 Mar 2024 18th alemelis 854 41 692ms 14 Aug 2024 20th Lv0Sys 🇵🇱 833 42 377ms 17 days ago 21st rollershutter 814 43 243ms 4 Jul 2024 22nd Shanethegamer 🇺🇸 795 44 393ms 4 Dec 2022 23rd stellartux 778 45 312ms 25 Dec 2023 24th detrumi 🇳🇱 761 46 436ms 26 Oct 2020 24th annaproxy 761 46 261ms 14 Feb 2022 26th czylabsonasa 🇭🇺 745 47 733ms 15 Jun 2022 26th msbranicky 745 47 287ms 15 Jan 2024 28th cure-honey 🇯🇵 729 48 402ms 5 Jul 2021 28th snoozingnewt 🇨🇦 729 48 383ms 14 Oct 2025 30th mossr 🇺🇸 714 49 798ms 22 Feb 2021 30th Yewzir 🇧🇪 714 49 336ms 23 Nov 2023 32nd laserb 700 50 404ms 25 Jan 2020 33rd roguh 🇬🇹 686 51 374ms 14 Jan 2024 34th p-vf 🇨🇭 673 52 270ms 28 Oct 2021 34th ToE42 673 52 255ms 5 May 2024 36th dymowski 660 53 270ms 7 Jul 2019 36th albanian-laundromat 660 53 209ms 14 Jul 2025 38th masflam 648 54 311ms 29 Aug 2020 38th StronkCheese 🇺🇸 648 54 246ms 4 Feb 2023 40th juntuu 614 57 228ms 25 Mar 2019 40th davbass 🇮🇹 614 57 343ms 21 Aug 2023 42nd garrisonhh 583 60 335ms 20 Nov 2020 43rd Smetalo 565 62 211ms 25 Aug 2022 44th tidalDisruptionEvent 🇨🇦 530 66 259ms 18 Mar 2023 45th sidok 522 67 782ms 5 May 2024 46th Betuaredead 515 68 280ms 11 Jan 2023 47th taigua 467 75 278ms 18 Aug 2020 48th KatieLG 🇬🇧 58 603 192ms 19 days ago 49th theunofficialcoder 47 738 206ms 18 Aug 2021 49th retrohun 47 738 214ms 27 Dec 2022 49th HumanoidCPU 47 738 223ms 18 May 2024 49th Mabeloid 🇳🇴 47 738 176ms 22 Sep 2024 49th CaedenHarper 🇨🇦 47 738 187ms 1 Feb 2025 54th JRaspass 🇬🇧 47 741 199ms 17 Mar 2021 55th mokymok 🇺🇸 40 883 232ms 10 Nov 2021 56th KatieLG-Transpiler 🇬🇧 38 930 211ms 23 Jun 2022 1–56 of 56