Overview
In this tutorial, we show you how to check valid date format using the
java.text.SimpleDateFormat.
Using SimpleDateFormat to check valid date format
package com.jackrutorial;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class ValidDateExample {
public static boolean isValidDate(String date, String dateFromat) {
if(date == null)
return false;
if(dateFromat == null)
return false;
SimpleDateFormat format = new SimpleDateFormat(dateFromat);
format.setLenient(false);
try {
format.parse(date.trim());
} catch (ParseException pe) {
pe.printStackTrace();
return false;
}
return true;
}
}
Testing with date format yyyy-MM-dd
package com.jackrutorial;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class ValidDateExample1 {
public static void main(String[] args) {
//testing with date1
String date1 = "2018-07-15";
String dateFromat = "yyyy-MM-dd";
if(isValidDate(date1, dateFromat)) {
System.out.println(date1 + " is valid date format");
} else {
System.out.println(date1 + " is invalid date format");
}
//testing with date2
String date2 = "a2018-07-15";
if(isValidDate(date2, dateFromat)) {
System.out.println(date2 + " is valid date format");
} else {
System.out.println(date2 + " is invalid date format");
}
}
public static boolean isValidDate(String date, String dateFromat) {
if(date == null)
return false;
if(dateFromat == null)
return false;
SimpleDateFormat format = new SimpleDateFormat(dateFromat);
format.setLenient(false);
try {
format.parse(date.trim());
} catch (ParseException pe) {
pe.printStackTrace();
return false;
}
return true;
}
}
Output
2018-07-15 is valid date format
java.text.ParseException: Unparseable date: "a2018-07-15"
at java.text.DateFormat.parse(DateFormat.java:366)
at com.jackrutorial.ValidDateExample1.isValidDate(ValidDateExample1.java:41)
at com.jackrutorial.ValidDateExample1.main(ValidDateExample1.java:22)
a2018-07-15 is invalid date format
