# Check Valid Date ## Write a program to check valid date Check if a given date is valid or not. ```txt Input : 2019-02-29 Output : False ``` --- ```c #include int is_leap_year(int year) { return (year % 4 == 0 ); } int is_valid_date(int day, int month, int year) { int days_in_month[] = {31, is_leap_year(year) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; if (month < 1 || month > 12) { return 0; } if (day < 1 || day > days_in_month[month - 1]) { return 0; } return 1; } int main() { int day, month, year; printf("Enter a date (dd/mm/yyyy): "); scanf("%d/%d/%d", &day, &month, &year); if (is_valid_date(day, month, year)) { printf("Valid date\n"); } else { printf("Invalid date\n"); } return 0; } ``` ```cpp #include void Isvalid(int dd, int mm, int yy) { if(yy>=1999 || yy<=2023) { if (mm>=1 || mm<=12){ if((dd>=1 || dd<=31) && (mm==1 || mm==3 || mm==5 || mm==7 || mm==8 || mm==10 || mm==12)) std::cout<<"date is valid this month contain 31 days"; else if((dd>=1 && dd<=30) && (mm==4 || mm==6 || mm==9 || mm==11)) std::cout<<"Date is valid this month contain 30 days"; else if((dd>=1 && dd<=28) && (mm==2)) std::cout<<"Date is valid it's feb"; else if(dd==29 && mm==2 &&(yy%4==0)) std::cout<<"Date is valid and it's a leap year"; else std::cout<<"Date is not valid"; } else { std::cout<<"Month is not valid"; } } else { std::cout<<"Year is not valid"; } } int main() { int a,b,c; std::cout<<"Enter date:"; std::cin>>a; std::cout<<"Enter month"; std::cin>>b; std::cout<<"Enter year"; std::cin>>c; Isvalid(a,b,c); return 0; } ``` ```csharp using System; using System.Globalization; namespace DateValidation { class Program { static void Main(string[] args) { DateTime d; bool chValidity = DateTime.TryParseExact( "2019-02-29", "MM/dd/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out d); Console.WriteLine(chValidity); } } } ``` ```java import java.time.LocalDate; import java.time.format.DateTimeParseException; import java.util.Scanner; public class CheckValidDate { public static boolean isDateValid(String input) { try { LocalDate.parse(input); return true; } catch (DateTimeParseException e) { return false; } } public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("Enter a date in the format 'yyyy-mm-dd':"); String input = scanner.nextLine(); if (isDateValid(input)) { System.out.println("True"); } else { System.out.println("False"); } } } ``` ```javascript let date = prompt("Enter a date (YYYY-MM-DD): "); function isValidDate(date) { return ( date && Object.prototype.toString.call(date) === "[object Date]" && !isNaN(date) ); } date = new Date(date); if (isValidDate(date)) { console.log("True"); } else { console.log("False"); } ``` ```kotlin import java.util.Scanner import java.time.format.DateTimeFormatter fun main() { print("Enter valid date format in yyyy-mm-dd : ") println() var input = readLine() try { println("Is $input valid date?: " + CheckValidDate(input!!)) } catch (exception: Exception) { println("Is $input valid date?: " + false) } } private fun CheckValidDate(date: String): Boolean { val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd") val formatted = formatter.parse(date) return true } ``` ```ruby # frozen_string_literal: true require 'date' def check_valid_date(date) Date.parse(date) true rescue ArgumentError false end if $PROGRAM_NAME == __FILE__ print 'Input : ' date = gets.chomp # Match the regular expression for a date if date =~ /\d{4}-\d{2}-\d{2}/ puts "Output : #{check_valid_date(date)}" else puts 'Output : Invalid date. Date must be in the format YYYY-MM-DD.' end end ``` ```swift import Foundation func isValidDate(_ dateString: String) -> Bool { let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd" dateFormatter.locale = Locale(identifier: "en_US_POSIX") dateFormatter.timeZone = TimeZone(secondsFromGMT: 0) dateFormatter.isLenient = false return dateFormatter.date(from: dateString) != nil } // Example usage let inputDate = "2019-02-29" let result = isValidDate(inputDate) print("Output: \(result)") ``` ```typescript function isValidDate(d: string | number | any): boolean { if (Object.prototype.toString.call(d) === "[object Date]") { // it is a date if (isNaN(d)) { // d.getTime() or d.valueOf() will also work // date object is not valid return false; } else { // date object is valid return true; } } else { return false; // not a date object } } console.log(isValidDate(new Date())); ``` ```go package main import ( "fmt" "time" ) func main() { var input string fmt.Printf("Enter date in YYYY-MM-DD format: ") fmt.Scan(&input) _, err := time.Parse("2006-01-02", input) if err != nil { fmt.Println("Invalid Date") } else { fmt.Println("Valid Date") } } ``` ```php 0 && $month < 13) { // if day is valid if ($day > 0 && $day < 32) { // if year is valid if ($year > 0 && $year < 9999) { // if day is valid for month if ($month == 2) { if ($day < 30 || ($day == 29 && $year % 4 == 0)) { echo 'True'; } else { echo 'False'; } } else if ($month == 4 || $month == 6 || $month == 9 || $month == 11) { if ($day < 31) { echo 'True'; } else { echo 'False'; } } else { echo 'True'; } } else { echo 'False'; } } else { echo 'False'; } } else { echo 'False'; } ``` ```perl sub isvaliddate { my $input = shift; if ($input =~ m!^((?:19|20)\d\d)[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$!) { # At this point, $1 holds the year, $2 the month and $3 the day of the date entered if ($3 == 31 and ($2 == 4 or $2 == 6 or $2 == 9 or $2 == 11)) { return 'False'; } elsif ($3 >= 30 and $2 == 2) { return 'False'; } elsif ($2 == 2 and $3 == 29 and not ($1 % 4 == 0 and ($1 % 100 != 0 or $1 % 400 == 0))) { return 'False'; } else { return 'True'; } } else { return 'False'; } } print isvaliddate('2019-02-29'); ``` ```python from datetime import date try: year, month, day = tuple(map(int, input().split("-"))) date(year=year, month=month, day=day) except ValueError: print("False") else: print("True") ```

Check Valid Date

Write a program to check valid date

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