Monday, February 18, 2008

Check if a String is a valid date

This example checks if a String is a valid date by parsing the String with an instance of the SimpleDateFormat class and returns true or false.
import java.text.SimpleDateFormat;
import java.text.ParseException;

public class DateTest {

  public boolean isValidDate(String inDate) {

    if (inDate == null)
      return false;

    //set the format to use as a constructor argument
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    if (inDate.trim().length() != dateFormat.toPattern().length())
      return false;

    try {
      //parse the inDate parameter
    catch (ParseException pe) {
      return false;
    return true;

  public static void main(String[] args) {

    DateTest test = new DateTest();

The output will be...

...since the year 2004 was a leap year.
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