friends i want to calculate how many Sundays come in two Dates
i have tried following code which is hard coded i have to impliment method which can give me number of Sundays between two Dates
please help me

import java.util.Date;

import java.text.DateFormat;
import java.text.SimpleDateFormat;

import java.util.Calendar ;
import java.util.GregorianCalendar;

public class DateDiffCalculator {
private static final SimpleDateFormat SDF = new SimpleDateFormat("yyyy-MMM-dd");

public DateDiffCalculator() {
}


public static Date getDate (String date) throws Exception {
//log.debug(" "+date);
return SDF.parse(date);
}

public static Date getDate (Date date) throws Exception {
// log.debug("date is "+date);
return getDate(SDF.format(date));
}

public static long getDiffInDays(Date d1,Date d2) {
boolean isdiffGreaterThanYear=false;
long diffInMilliSeconds=d1.getTime()-d2.getTime();
return diffInMilliSeconds/(1000*60*60*24);

}

public static int getYear(String date) {
//String[] day= {Sun,Mon,Tue,Wed,Thu,Fri,Sat};
Integer year=new Integer(date.substring(0,4));
return year.intValue();
}

public static int getMonth(String date) {
//String date.substring(5,7);
System.out.println(" "+date.substring(5,8));
String m= date.substring(5,8);
int month=0;
if(m.equalsIgnoreCase("Jan")) {
month=1;
}

if(m.equalsIgnoreCase("Feb")) {
month=2;
}

if(m.equalsIgnoreCase("Mar")) {
month=3;
}

if(m.equalsIgnoreCase("Apr")) {
month=4;
}

if(m.equalsIgnoreCase("May")) {
month=5;
}

if(m.equalsIgnoreCase("Jun")) {
month=6;
}

if(m.equalsIgnoreCase("Jul")) {
month=7;
}

if(m.equalsIgnoreCase("Aug")) {
month=8;
}

if(m.equalsIgnoreCase("Sep")) {
month=9;
}

if(m.equalsIgnoreCase("Oct")) {
month=10;
}

if(m.equalsIgnoreCase("Nov")) {
month=11;
}

if(m.equalsIgnoreCase("Dec")) {
month=12;
}

return month;
}

public static int getDay(String date) {
Integer day=new Integer(date.substring(9,11));
return day.intValue();

}

public static int getNumberofSundays(String d1,String d2) throws Exception {
//d1 is leave start date d2 is leave end date

// get object in Date form
Date date1=getDate(d1);
Date date2=getDate(d2);

// now get calender objects from it
GregorianCalendar c1= new GregorianCalendar(getYear(d1),getMonth(d1),getDay(d1));
GregorianCalendar c2= new GregorianCalendar(getYear(d2),getMonth(d2),getDay(d2));

// get period
long leavePeriod = getDiffInDays(date1,date2);



return 12; // it should return number of sundays but we type 12 to perform compilation
}

public static void main(String[] arg)throws Exception {
System.out.println(" "+getNumberofSundays("2005-Oct-07","2006-Mar-01"));





}
}

 

 

[url=http://www.javaworld.com/jw-12-2000/jw-1229-dates.html]Calculating Java dates: Take the time to learn how to create and use dates[/url]
[url=http://www.javaworld.com/javaworld/jw-03-2001/jw-0330-time.html]Working in Java time: Learn the basics of calculating elapsed time in Java[/url]

 

 

Have you tried get(Calendar.DAY_OF_WEEK). This should give you the day of the week for a certain date.

 

 

thanks now i have modified the get Month Code
as follows

public static int getMonth(String date) {
//String date.substring(5,7);
System.out.println(" "+date.substring(5,8));
String m= date.substring(5,8);
int month=0;
if(m.equalsIgnoreCase("Jan")) {
month=0;
}

if(m.equalsIgnoreCase("Feb")) {
month=1;
}

if(m.equalsIgnoreCase("Mar")) {
month=2;
}

if(m.equalsIgnoreCase("Apr")) {
month=3;
}

if(m.equalsIgnoreCase("May")) {
month=4;
}

if(m.equalsIgnoreCase("Jun")) {
month=5;
}

if(m.equalsIgnoreCase("Jul")) {
month=6;
}

if(m.equalsIgnoreCase("Aug")) {
month=7;
}

if(m.equalsIgnoreCase("Sep")) {
month=8;
}

if(m.equalsIgnoreCase("Oct")) {
month=9;
}

if(m.equalsIgnoreCase("Nov")) {
month=10;
}

if(m.equalsIgnoreCase("Dec")) {
month=11;
}

return month;
}
but question remains same how to calculate number of Sundays Between 2 Dates

 

 

i have modified code as follows

public static long getDiffInDays(Date d1,Date d2) {
boolean isdiffGreaterThanYear=false;
long diffInMilliSeconds=d1.getTime()-d2.getTime();
return diffInMilliSeconds/(1000*60*60*24);

}

public static int getNumberofSundays(String d1,String d2) throws Exception {

// get object in Date form
Date date1=getDate(d1);
Date date2=getDate(d2);

long leavePeriod = Math.abs(getDiffInDays(date1,date2));

float noOfWeeks=leavePeriod/7;

System.out.println("no of weeks"noOfWeeks" remainder "+remainder);


return (int)noOfWeeks;
}

when i divide leavePeriod by 7 it gives me no of weeks no of weeks is equal to no of sundays
but how to handle than flot value

 

 

It shouldn't be that hard if you have the weekday of the starting date and the total number of days.

 

 

I need some time to give u the best result

 

 

This thread is two years old. Please in future check that your brain is securely fastened before entering the forum.

 

 

Any more time and they will be fucking dead before you give them a solution.

 

 

*i changed getNumberofSundays Method. I think it is use ful for you*

public static int getNumberofSundays(String d1,String d2) throws Exception {
//d1 is leave start date d2 is leave end date

// get object in Date form
Date date1=getDate(d1);
Date date2=getDate(d2);

// now get calender objects from it
GregorianCalendar c1= new GregorianCalendar(getYear(d1),getMonth(d1),getDay1(d1));
GregorianCalendar c2= new GregorianCalendar(getYear(d2),getMonth(d2),getDay1(d2));
System.out.println("DAY_OF_MONTH: " c1.get(Calendar.DAY_OF_MONTH));
System.out.println("DAY_OF_YEAR: " c1.get(Calendar.DAY_OF_YEAR));
System.out.println("DAY_OF_WEEK: " c1.get(Calendar.DAY_OF_WEEK));
System.out.println("DAY_OF_MONTH: " c2.get(Calendar.DAY_OF_MONTH));
System.out.println("DAY_OF_YEAR: " c2.get(Calendar.DAY_OF_YEAR));
System.out.println("DAY_OF_WEEK: " c2.get(Calendar.DAY_OF_WEEK));
int noofsun=0;

long leavePeriod = Math.abs(getDiffInDays(date1,date2));
System.out.println("total No of Days"leavePeriod);
float noOfWeeks=leavePeriod/7;
noofsun=(int)noOfWeeks;
if(c1.get(Calendar.DAY_OF_WEEK)+leavePeriod%7>=7)
noofsun=noofsun+1;

//System.out.print(date2.getDay());
//System.out.println("no of weeks"+noOfWeeks" remainder +remainder"+leavePeriod%7);
//System.out.println("total sun"+noofsun);
return noofsun;

// it should return number of sundays but we type 12 to perform compilation
}