Find out Number of Holidays in a month or date range using Java

To findout the number of Holidays in a given date range or in a month

Calendar format should be year, month-1, day

Here is java class to findout the number of holidays of a given data range(two dates)

//HolidayFinder class

package com.hbd.rms.util;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;

/**
* @author velmurugan pousel
* created on Sep 2, 2010 for RMS
* WorkingDaysFinder.java on Sep 2, 2010
*/
public class HolidaysFinder {

/**
* holidaylist holds the list of national/local holidays for the date range
* the format of the calender is (year,month-1,date)
*/
static List holidayList = new ArrayList();

// holiday list
static {
//holidayList.add(new GregorianCalendar(2010, 8, 18));// holiday on the given month
holidayList.add(new GregorianCalendar(2010, 11, 24));// holiday on the given month
}

/**
* check the given date is on holiday list
* @param calendardate
* @return
*/
public static boolean isHoliday(Calendar cal) {
return holidayList.contains(cal);
}

/**
* method to find out number of holidays between the given date range
* @param first
* @param second
* @return
*/
public static int countNumberOfSaturdaysAndSundays(GregorianCalendar first,
GregorianCalendar second) {

int count = 0;
GregorianCalendar currentcalendarday = first;
GregorianCalendar lastcalendarday = second;

while (currentcalendarday.getTime().getTime() < lastcalendarday.getTime().getTime()) {
if (isOnSaturday(currentcalendarday)) {
count++;
} else if (isOnSunday(currentcalendarday)) {
count++;
} else if (isHoliday(currentcalendarday)) {
count++;
}
currentcalendarday.add(Calendar.DATE, 1);
}

if (isSameDay(currentcalendarday, lastcalendarday)) {

if (isOnSaturday(currentcalendarday)) {
count++;
} else if (isOnSunday(currentcalendarday)) {
count++;
} else if (isHoliday(currentcalendarday)) {
count++;
}
}
return count;
}


/**
* check the given date is saturday
* @param calendardate
* @return
*/
public static boolean isOnSaturday(Calendar calendardate) {

if (calendardate.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY) {
System.out.println("Debug: "
+ String.valueOf(calendardate.get(Calendar.DATE)) + "-"
+ String.valueOf(calendardate.get(Calendar.MONTH) + 1)
+ "-" + String.valueOf(calendardate.get(Calendar.YEAR))
+ " is a SATURDAY.");
} else {
System.out.println("Debug: "
+ String.valueOf(calendardate.get(Calendar.DATE)) + "-"
+ String.valueOf(calendardate.get(Calendar.MONTH) + 1)
+ "-" + String.valueOf(calendardate.get(Calendar.YEAR))
+ " is not a SATURDAY.");
}

return (calendardate.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY);
}


/**
* check the given date is sunday
* @param calendardate
* @return
*/
public static boolean isOnSunday(Calendar calendardate) {

if (calendardate.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
System.out.println("Debug: "
+ String.valueOf(calendardate.get(Calendar.DATE)) + "-"
+ String.valueOf(calendardate.get(Calendar.MONTH) + 1)
+ "-" + String.valueOf(calendardate.get(Calendar.YEAR))
+ " is a SUNDAY.");
} else {
System.out.println("Debug: "
+ String.valueOf(calendardate.get(Calendar.DATE)) + "-"
+ String.valueOf(calendardate.get(Calendar.MONTH) + 1)
+ "-" + String.valueOf(calendardate.get(Calendar.YEAR))
+ " is not a SUNDAY.");
}

return (calendardate.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY);
}


public static boolean isSameDay(Calendar cal1, Calendar cal2) {
if (cal1 == null || cal2 == null) {
throw new IllegalArgumentException("The date must not be null");
}
return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) &&
cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR));
}

public static void main(String args[]) {
// to findout the number of holidays between these two dates
GregorianCalendar firstdate = new GregorianCalendar();
GregorianCalendar seconddate = new GregorianCalendar(2010, 11, 30);
System.out.println(" year..."+ seconddate.get(Calendar.YEAR));
System.out.println("holiday conunt = " + countNumberOfSaturdaysAndSundays(firstdate, seconddate));
}

}

Here is the code to test with two dates(date1,date2)...

To Find out the holidays between these dates

convert the dates into calendar

GregorianCalendar firstdate = new GregorianCalendar();
GregorianCalendar seconddate = new GregorianCalendar();
firstdate.settime(date1);
seconddate .settime(date2);
// call the method

countNumberOfSaturdaysAndSundays(firstdate, seconddate));
...
...