How to get diff of days between 2 dates

Hi,
I have a given date . I am looking for a simple way to get the difference of days between the 2 date like :
currentDay - givenDate Day > 20 .
I am using calendar for this. MyCode:
java.util.Calendar calendar1 = Calendar.getInstance();
calendar1.set(2003, 08,16);
int userCreatedDay = calendar1.get(Calendar.DAY_OF_YEAR);
java.util.Calendar calendar2 = Calendar.getInstance();
int currDay = calendar2.get(java.util.Calendar.DAY_OF_MONTH);
int currYear = calendar2.get(java.util.Calendar.YEAR);
int currMonth = calendar2.get(java.util.Calendar.MONTH);
int days= currDay - userCreatedDay;
System.out.println("currDay:"+currDay+",createDay:"+userCreatedDay);
System.out.println("Days left:"+currDay - userCreatedDay);
if(days > 14) return true;
o/P:
currDay:266,createDay:249
Days left : 17
If i calculate today diff of days in only 7. I am not able to understand why the result is being displayed as 17.
Is there anything wrong i am uisng this class.
Please, help

Personally, I do not like using the calendar class for this sort of thing. Why? Weel lets look at two simple dates: 4th of July 1777 and 21st March 2003.
So I would create 2 GregorianCalendar objectsGregorianCalendar independenceDay = new GregorianCalendar (1777, 6, 4);
GregorianCalendar startOfIraqWar = new GregorianCalendar (2003, 2, 12);Now what do these contain? Well, here is the output (cut down for clarity)...
independenceDay = [time=?, YEAR=1777,MONTH=6,WEEK_OF_YEAR=?,WEEK_OF_MONTH=?,
                   DAY_OF_MONTH=4,DAY_OF_YEAR=?,DAY_OF_WEEK=?,
                   DAY_OF_WEEK_IN_MONTH=?]
startOfIraqWar = [time=?, YEAR=2003,MONTH=2,WEEK_OF_YEAR=?,WEEK_OF_MONTH=?,
                   DAY_OF_MONTH=12,DAY_OF_YEAR=?,DAY_OF_WEEK=?,
                   DAY_OF_WEEK_IN_MONTH=?]
So what don't I like? All the useful fields are not filled in. They ***could*** be calculated by the constructor, but they aren't, particularly things like DAY_OF_YEAR, which would ease calculation enormously.
What I would really like to see in GregorianCalendar is a diff() method which takes a GregorianCalendar as its argument and returns a time difference. In fact, you may want several, or an additional argument daying how you want the diff returned (days, years, seconds).

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see these codes of rich
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Hello -
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CREATE
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As DateTime,@EndDate
AS DateTime)
RETURNS
INT AS
BEGIN
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AS Int= 0
DECLARE @Date
As Date=@StartDate
WHILE @Date
< @EndDate
BEGIN
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OR (SELECT
Count(*)
FROM YourTicketTable WHERE TicketDate=@Date)=1)
BEGIN
SELECT @Count = @Count
+ 1
END
SELECT @Date=DATEADD(Day,
1,@Date)
END
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Mukesh_Prajapat wrote:
How can I get number of days between 2 dates ?
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[How To Ask Questions The Smart Way|http://www.catb.org/~esr/faqs/smart-questions.html]

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hi can any one tell me how to get the todays julian date using Calender class or GregorianCalender class....
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Message was edited by:
lad_tushar

thanks a lot....for intrest....
I have found some details about the Julian calendar as follows:
The Julian date for 2006: JAN: 01:12:01:59 is 2453737.00138
245 represent the year digits for year 2006
3737 represent the date fir 1 Jan
.00138 represents the time for 12:01:59
Julian date change as per every day 12 noon it increase one digit in it.
As per ref from
http://www.aavso.org/observing/aids/jdcalendar.shtml
Also chk this calendar where Julian date is 20. October 2006 for 02 November 2006
As per ref from
http://www.calendar.sk/julian_calendar-en.php
I have tried the pure �GregorianCalendar� class from jdk1.4 API and its setGregorianChange method but not getting as per the expected Julian date format. Using the �setGregorianChange()� i have setting the cutover date to Long.MAX_VALUE it means GregorianCalendar now have to act as per the Julian calendar ...so after setting the cutover date it return me changed date using �getGregorianChange()� but that was not the Julian date of the current date...as expected or as per above both scenario. Even though the last two digits are nowhere equal to the actual Julian date.
Program
GregorianCalendar cal = new GregorianCalendar();
cal.setGregorianChange(new Date(Long.MAX_VALUE)); // setting the calendar to act as a pure Julian calendar.
// cal.set(Calendar.DATE, new Date().getDate()); // seting the current date
// Date todayJD = cal.getGregorianChange(); // getting the changed date after the setGregorianChange
Date todayJD = cal.getTime(); // getting the calculated time of today�s Julian date
SimpleDateFormat sdfJulianDate = new SimpleDateFormat("yyDDD");
SimpleDateFormat sdfJuliandayOfYear = new SimpleDateFormat("DDD");
System.out.println("today Date = " + new Date());
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OUTPUT:
USING : Date todayJD = cal.getGregorianChange();
Today Date = Thu Nov 02 15:17:05 IST 2006
Today as julian date = 94229
Today as day of year = 229
USING : cal.set(Calendar.DATE, new Date().getDate());
Today Date = Thu Nov 02 15:19:22 IST 2006
Today as julian date = 06319
Today as day of year = 319
USING : Date todayJD = cal.getTime();
Today Date = Thu Nov 02 15:17:59 IST 2006
Today as julian date = 06306
Today as day of year = 306
There is one another concept i found to get the Julian day of the year as per the Julian day chart mention on nasa site (http://angler.larc.nasa.gov/armsgp/JulianDayChart.html) and i m getting the moth of the year that is 306 for nov 02 2006 using getTime() method in above code then the out put is right for Julian day. But it was not as per the expected Julian date format. So in conclusion we can only able to retrieve the day of year for the Julian calendar. hope their will be a solution for this problem in java api ....else we allways have to depend upon the third party api that was not accepteble some times.....
Kindly chk chart on the site
http://angler.larc.nasa.gov/armsgp/JulianDayChart.html
http://weather.uwaterloo.ca/julian.html
http://www.fs.fed.us/raws/book/julian.shtml
Thanks,
Tushar Lad

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