How to compare date range ?

Question

hi, good day , i need some idea on my issue
scenario :
i need to know if given a new date range, and check whether this new date range is fall into between the date range
for example ,
new_start_date = 15/05/2006, new_end_date = 01/09/2006
existing start_date = 20/02/2006 , existing end_date = 11/07/2006 so in this case , new start and end date have fall into existing start and end date range, cause it should not interlapse the date range
- in short, new start_date and end_date cannot in between of existing start_date and end_date , how i write a algorithm on this ? thank you for guidance

Answer 1

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
* DateSample.java
* Created on February 9, 2006, 10:09 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
* @author krichard
public class DateSample {
     *  new_start_date = 15/05/2006, new_end_date = 01/09/2006
     *  existing start_date = 20/02/2006 , existing end_date = 11/07/2006
    /** Creates a new instance of DateSample */
    public DateSample() {
        String existingStartDateStr = "20/02/2006" ;
        String existingEndDateStr = "11/07/2006" ;
        String newStartDateStr = "15/05/2006" ;
        String newEndDateStr = "01/09/2006" ;
        SimpleDateFormat dateUtil = new SimpleDateFormat("dd/MM/yyyy") ;
        try {
            Date existingStartDate = dateUtil.parse(existingStartDateStr);
            Date existingEndDate = dateUtil.parse(existingEndDateStr);
            Date newStartDate = dateUtil.parse(newStartDateStr);
            Date newEndDate = dateUtil.parse(newEndDateStr);
            boolean newStartCheck = existingStartDate.before(newStartDate) && existingEndDate.after(newStartDate);
            boolean newEndCheck = existingStartDate.before(newEndDate) && existingEndDate.after(newEndDate);
            boolean inBetween = newStartCheck & newEndCheck ;
            System.out.println("Existing::"+existingStartDate+" - " +existingEndDate);
            System.out.println("New::"+newStartDate+" - " +newEndDate);
            System.out.println("It is "+inBetween+" that the new dates are in between the existing ones.");
        } catch (ParseException ex) {
            ex.printStackTrace();
     * @param args the command line arguments
    public static void main(String[] args) {
        new DateSample() ;
}