Kata Library
Sign Up
Time to claim your honor
Training
Practice
Complete challenging
Kata
to earn honor and ranks. Re-train to hone technique
Freestyle Sparring
Take turns remixing and refactoring others code through
Kumite
Community
Leaderboards
Achieve honor and move up the global leaderboards
Chat
Join our
Discord
server and chat with your fellow code warriors
Discussions
View our
Github Discussions
board to discuss general Codewars topics
About
Docs
Learn about all of the different aspects of Codewars
Blog
Read the latest news from Codewars and the community
Log In
Sign Up
Library
Collections
Newest
Oldest
Popularity
Positive Feedback
Most Completed
Least Completed
Hardest
Easiest
Name
Relevance
Low Satisfaction
All
My Languages
Agda (Beta)
BF (Beta)
C
CFML (Beta)
Clojure
COBOL (Beta)
CoffeeScript
CommonLisp (Beta)
Coq
C++
Crystal
C#
D (Beta)
Dart
Elixir
Elm (Beta)
Erlang (Beta)
Factor (Beta)
Forth (Beta)
Fortran (Beta)
F#
Go
Groovy
Haskell
Haxe (Beta)
Idris (Beta)
Java
JavaScript
Julia (Beta)
Kotlin
λ Calculus (Beta)
Lean
Lua
NASM
Nim (Beta)
Objective-C (Beta)
OCaml (Beta)
Pascal (Beta)
Perl (Beta)
PHP
PowerShell (Beta)
Prolog (Beta)
PureScript (Beta)
Python
R (Beta)
Racket
Raku (Beta)
Reason (Beta)
RISC-V (Beta)
Ruby
Rust
Scala
Shell
Solidity (Beta)
SQL
Swift
TypeScript
VB (Beta)
Approved & Beta
Approved
Beta
All
Kata I have not trained on
Kata I have not completed
Kata I have completed
8 kyu
easiest
7 kyu
6 kyu
5 kyu
4 kyu
3 kyu
2 kyu
1 kyu
hardest
Algorithms
5
Arrays
4
Date Time
59
Design Patterns
1
Fundamentals
59
Geometry
1
JSON
1
Mathematics
4
Object-oriented Programming
1
Parsing
2
Puzzles
1
Regular Expressions
5
Strings
6
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
59 Kata Found
7 kyu
regex validation of 24 hours time.
1,904
daymos
5 Issues Reported
Regular Expressions
Date Time
Fundamentals
7 kyu
Elapsed Seconds
8,666
jhoffner
1 Issue Reported
Date Time
Fundamentals
6 kyu
NASA Countdown
311
lilc4t
Date Time
Fundamentals
7 kyu
Find Your Villain Name
4,989
yaphi1
3 Issues Reported
Arrays
Date Time
Fundamentals
6 kyu
The latest clock
2,886
nirgn
Date Time
Fundamentals
Algorithms
8 kyu
Remove the time
18,523
radiocontrolled
3 Issues Reported
Date Time
Parsing
Fundamentals
8 kyu
Is your period late?
11,915
int3_0xcc
Fundamentals
Date Time
6 kyu
Age from DOB
186
Exadon
Date Time
Fundamentals
7 kyu
How many Katas should I have done?
148
Blune
Date Time
Fundamentals
6 kyu
Christmas Present Calculator
423
zruF
Date Time
Fundamentals
6 kyu
Berlin Clock
557
dupreesi
3 Issues Reported
Date Time
Strings
Fundamentals
7 kyu
Decimal Time Conversion
1,246
Galvlbit
Fundamentals
Algorithms
Date Time
Strings
6 kyu
Minutes to Midnight
1,219
zruF
2 Issues Reported
Date Time
Fundamentals
6 kyu
Count the days!
2,183
zruF
1 Issue Reported
Date Time
Fundamentals
7 kyu
Can Santa save Christmas?
4,479
zruF
Date Time
Fundamentals
7 kyu
The Coupon Code
31,331
yaphi1
2 Issues Reported
Date Time
Strings
Fundamentals
7 kyu
Milk and Cookies for Santa
6,709
xDranik
1 Issue Reported
Date Time
Fundamentals
7 kyu
What time is it in Japan ?
263
ddellaquila
1 Issue Reported
Fundamentals
Date Time
7 kyu
Can I play right now?
611
nesusvet
Date Time
Fundamentals
7 kyu
Every beginning has an end (Dates)
274
willjharmer
Date Time
Fundamentals
6 kyu
On the clock
139
edgecase963
Date Time
Fundamentals
6 kyu
Pretty date
886
burce
Date Time
Fundamentals
7 kyu
Age in days
1,487
user5266704
2 Issues Reported
Date Time
Fundamentals
Beta
Date Sanity Methods
40
wthit56
Status:
Testing & feedback needed
Estimated Rank:
5 kyu
Date Time
Fundamentals
6 kyu
Timer Decorator
834
filipkonieczny
3 Issues Reported
Fundamentals
Design Patterns
Object-oriented Programming
Date Time
5 kyu
validDate Regex
1,851
wthit56
4 Issues Reported
Date Time
Regular Expressions
Fundamentals
7 kyu
Jubilee Year
470
pepellou
1 Issue Reported
Date Time
Fundamentals
7 kyu
#~For Kids~# d/m/Y -> Day of the week.
973
ALNeneve
Fundamentals
Date Time
6 kyu
Determine the date by the day number
1,561
LarisaOvchinnikova
Fundamentals
Date Time
Algorithms
6 kyu
Numerology
2,216
user4806669
1 Issue Reported
Date Time
Fundamentals
Loading...
Confirm
Collect:
undefined
Loading collection data...