The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Leap Years 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 45th b10011 🇫🇮 980 41 9ms 8 Jan 2023 45th DialFrost 🇸🇬 980 41 9ms 23 Jan 2023 45th inventshah 980 41 9ms 26 Jan 2023 45th neel11235813 980 41 8ms 14 Feb 2023 45th stefangimmillaro 980 41 9ms 19 Feb 2023 45th xsot 🇸🇬 980 41 9ms 19 Mar 2023 45th ovs-code 🇩🇪 980 41 9ms 29 Sep 2023 45th lukegustafson 🇺🇸 980 41 9ms 17 Nov 2023 45th trinityy-7 980 41 9ms 17 Dec 2023 45th helbling 🇨🇭 980 41 9ms 14 May 2024 45th vlpx 🇫🇮 980 41 9ms 18 Jun 2024 45th pardouin 🇫🇷 980 41 9ms 5 Aug 2024 45th dokutan 980 41 9ms 25 Sep 2024 45th b-illy 🇬🇧 980 41 9ms 28 Sep 2024 45th kirjavascript 980 41 9ms 1 Jun 2025 45th fuzzylojik-golf 🇺🇸 980 41 9ms 28 Jun 2025 45th Nemikolh 🇫🇷 980 41 8ms 15 Jul 2025 45th Yax42 🇫🇷 980 41 9ms 9 Sep 2025 45th qpwoeirut 980 41 8ms 14 Oct 2025 45th Babafaba 980 41 9ms 15 Oct 2025 45th KasperKivimaeki 🇫🇮 980 41 8ms 1 Nov 2025 45th CornerMercury 🇬🇧 980 41 9ms 13 days ago 45th edsrzf 🇳🇿 980 41 9ms 6 hours ago 104th HPWiz 🇳🇿 977 28 188ms 4 Oct 2020 104th primo-ppcg 🇹🇭 977 28 125ms 5 Oct 2020 104th GrayJoKing 🇦🇺 977 28 187ms 18 Oct 2020 104th sisyphus-ppcg 🇦🇺 977 28 140ms 21 Jun 2021 104th Lydxn 🇨🇦 977 28 166ms 25 Sep 2021 104th nwellnhof 🇩🇪 977 28 155ms 28 Sep 2021 110th HPWiz 🇳🇿 975 29 2ms 4 Dec 2018 110th primo-ppcg 🇹🇭 975 29 2ms 4 Dec 2018 110th GrayJoKing 🇦🇺 975 29 2ms 28 Mar 2021 110th sisyphus-ppcg 🇦🇺 975 29 2ms 21 Jun 2021 110th o0lit3 🇺🇸 975 29 3ms 12 Sep 2021 110th Lydxn 🇨🇦 975 29 3ms 26 Sep 2021 110th nwellnhof 🇩🇪 975 29 3ms 28 Sep 2021 110th saito-ta 🇯🇵 975 29 2ms 24 Jun 2022 118th Lydxn 🇨🇦 974 33 57ms 9 Feb 2022 118th JayXon 🇺🇸 974 33 57ms 9 Feb 2022 120th lynn 971 28 34ms 12 Apr 2021 120th HPWiz 🇳🇿 971 28 34ms 17 Apr 2021 120th ovs-code 🇩🇪 971 28 32ms 6 Feb 2024 123rd GrayJoKing 🇦🇺 969 28 2ms 26 Mar 2021 124th Lydxn 🇨🇦 969 54 412ms 24 Nov 2022 125th JayXon 🇺🇸 965 32 1,061ms 24 Mar 2021 125th GrayJoKing 🇦🇺 965 32 1,040ms 24 Mar 2021 125th primo-ppcg 🇹🇭 965 32 1,012ms 27 Mar 2021 125th Lydxn 🇨🇦 965 32 1,087ms 22 Aug 2021 125th MeWhenI 🇻🇦 965 32 985ms 10 Oct 2022 125th sean-niemann 🇺🇸 965 32 933ms 10 Oct 2022 125th Steffan153 🇫🇮 965 32 880ms 26 Dec 2022 125th inventshah 965 32 970ms 27 Sep 2023 125th DialFrost 🇸🇬 965 32 912ms 8 Nov 2023 125th FlyingPenguin223 965 32 911ms 11 Feb 2025 125th pardouin 🇫🇷 965 32 915ms 11 Apr 2025 125th fuzzylojik-golf 🇺🇸 965 32 833ms 31 Aug 2025 137th JayXon 🇺🇸 963 44 9ms 10 Feb 2022 137th btnlq 963 44 9ms 10 Feb 2022 137th 4atj 963 44 10ms 30 Jun 2025 140th targrik 963 46 4ms 17 Dec 2024 141st JayXon 🇺🇸 962 35 538ms 17 Apr 2021 141st Lydxn 🇨🇦 962 35 504ms 22 Aug 2021 141st sean-niemann 🇺🇸 962 35 495ms 30 Sep 2022 141st Steffan153 🇫🇮 962 35 423ms 26 Dec 2022 141st DialFrost 🇸🇬 962 35 460ms 8 Nov 2023 146th Lydxn 🇨🇦 960 44 1ms 9 Feb 2022 146th JayXon 🇺🇸 960 44 1ms 9 Feb 2022 148th JayXon 🇺🇸 959 59 363ms 21 Nov 2021 148th Lydxn 🇨🇦 959 59 313ms 21 Nov 2021 148th lynn 959 59 312ms 21 Nov 2021 148th primo-ppcg 🇹🇭 959 59 311ms 21 Nov 2021 148th btnlq 959 59 310ms 22 Dec 2021 153rd primo-ppcg 🇹🇭 958 39 70ms 11 Mar 2021 154th JayXon 🇺🇸 958 65 457ms 24 Sep 2025 154th Lydxn 🇨🇦 958 65 323ms 9 days ago 156th chloeching-amino 957 42 9ms 24 May 2020 156th janlelis 957 42 9ms 10 Feb 2021 156th KatieLG 🇬🇧 957 42 9ms 15 Apr 2021 156th sultan 957 42 9ms 2 May 2021 156th Y0UR-U5ERNAME 957 42 9ms 5 Sep 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