LeapYear

[Shaan Shar]

I have seen recently code of GregorianCalendar in which I saw the function of isLeapYear:

That was as follows:

[B]    public boolean isLeapYear(int year) {
        return year >= gregorianCutoverYear ?
            ((year%4 == 0) && ((year%100 != 0) || (year%400 == 0))) : // Gregorian
            (year%4 == 0); // Julian
    }[/B]

Now I really cann't relate why there is a reason to check whether is it divisible by 100 and 400 after checking divisible by 4.... I mean to say that if a number is divisible by 4 then it will be automatically divisible by 100 and 400.....

Then what is the use.......


COuld anybody explain this one...

I also don't understand why the code is checking that passed parameter is whether greater then 1582 or not.....

[Keith Lynn]

http://www.timeanddate.com/date/leapyear.html

[Ulf Dittmer]

I mean to say that if a number is divisible by 4 then it will be automatically divisible by 100 and 400.

So 8 is divisible by 100?

As to 1582, the Gregorian Calendar did not exist before (and there is a 10-day leap in that year).
[ May 03, 2006: Message edited by: Ulf Dittmer ]

[Shaan Shar]

Oh sorry folks:

I thought it in other way...

...

Well nyways
sorry for this silly question.....