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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.text.ParseException;
  7. import java.text.SimpleDateFormat;
  8. import java.util.Date;
  9.  
  10. /* Name of the class has to be "Main" only if the class is public. */
  11. class Ideone
  12. {
  13. 	public static void main (String[] args) throws java.lang.Exception
  14. 	{
  15.     String dateFormat = "yyyy-MM-dd";
  16.     String dateToValidate = "18-12-18";
  17.  
  18.     if(!isThisDateValid(dateToValidate,dateFormat)){
  19.         System.out.println("Date is invalid");
  20.     }
  21.     else{
  22.         System.out.println("Date is valid");
  23.     }
  24. 	}
  25.  
  26.  
  27.        public static boolean isThisDateValid(String dateToValidate, String dateFromat){
  28.  
  29.         if(dateToValidate == null){
  30.             return false;
  31.         }
  32.         if(!dateToValidate.matches("\\d{4}-\\d{2}-\\d{2}")){
  33.         	return false;
  34.         }
  35.  
  36.         SimpleDateFormat sdf = new SimpleDateFormat(dateFromat);
  37.         sdf.setLenient(false);
  38.  
  39.         try {
  40.             Date date = sdf.parse(dateToValidate);
  41.  
  42.         } catch (ParseException e) {
  43.             return false;
  44.         }
  45.  
  46.         return true;
  47.     }
  48. }
Success #stdin #stdout 0.09s 27732KB
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Standard input is empty
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Date is invalid
https://ideone.com/ryN7HO
language:
Java (12.0.1)
created:
7 years ago
visibility:
public

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