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  1. #1
    veena is offline Member
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    Default calendar of 12months when year is entered

    hi everyone,

    i need to take year and month as input and generate a calendar for 12months,
    i need to rite a jsp page with servlet

    can any 1 helpplz
    Last edited by veena; 05-05-2008 at 03:38 PM.

  2. #2
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  3. #3
    veena is offline Member
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    yes i did and cudnt find anything

  4. #4
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    Ok, here is a way.

    Java Code:
    N = d + 2m + [3(m+1)/5] + y + [y/4] - [y/100] + [y/400] + 2
    d - days of a monthe
    m - moth id(from 1 to 12 respectively)
    y - year

    Do the calculations and find the N. Keep in mind that to drop the remainder in each [] and only get the whole number. Don't rounding off numbers. Then divide the N by 7. Remainder give the answer, day of the week.

    0 - Saturday
    1 - Sunday
    2 - Monday
    3 - Tuesday and so on.

    Try it and see.

  5. #5
    Eranga's Avatar
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    Ah, made a mistake in my explanation. Here is an example for today(5/5/2008)

    Java Code:
    N = 5 + 2(5) + [3(6)/5] + 2008 + [2008/4] - [2008/100] + [2008/400] + 2
    
    N = 5 + 10 + 3 + 2008 + 502 - 20 + 5 + 2
    
    N = 2515
    After dividing by 7, remainder is 2, means that today is Monday. Yep, it's correct.

    d is not the number of days of the month. Days spending up to date which we want to processing.

    Did you get it?

  6. #6
    veena is offline Member
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    im trying to write in servlet and get in jsp
    Last edited by veena; 05-05-2008 at 03:40 PM.

  7. #7
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    The way Eranga explain it is correct. except you have to account for leap years. which you do with an array I forget the exact table.
    My IP address is 127.0.0.1

  8. #8
    Eranga's Avatar
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    Quote Originally Posted by veena View Post
    i tried for 1/1/2008
    but im getting N=1 which is monday where i shud get tuesday as first day
    You made a mistake there again.

    Java Code:
    N = 1 + 2(1) + [3(2)/5] + 2008 + [2008/4] - [2008/100] + [2008/400] + 2
    
    N = 1 + 2 + 1 + 2008 + 502 - 20 + 5 + 2
    
    N = 2502
    Divide N by 7, remainder is 3. Means it's Tuesday. Check it again. :)

  9. #9
    veena is offline Member
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    hey Eranga

    when u add up N=2501

  10. #10
    Eranga's Avatar
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    Is it.

    Java Code:
    N = 1 + 2(1) + [3(2)/5] + 2008 + [2008/4] - [2008/100] + [2008/400] + 2
    
    N = 1 + 2 + 1 + 2008 + 502 - 20 + 5 + 2
    
    N = 5 + 2008 + 502 - 20 + 7
    
    N = 2510 - 20 + 12
    
    N = 2502
    Where I'm going wrong pal. Can you pointed it for me?

  11. #11
    veena is offline Member
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    let me try again
    Last edited by veena; 05-05-2008 at 03:41 PM.

  12. #12
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    Linky
    Try this on for size.
    My IP address is 127.0.0.1

  13. #13
    Eranga's Avatar
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    Go it. I've miss a very important rule there. Really sorry about. Still I remembering this and let you know, because I do those things few years back when I'm in the university for maths.

    You have to use numbers 13 and 14 for the months of January and February, with the previous year. In our discussion,

    1/1/2008 should be 1/13/2007.

    Lets try it.

    Java Code:
    N = 1 + 2(13) + [3(14)/5] + 2007 + [2007/4] - [2007/100] + [2007/400] + 2
    
    N = 1 + 26 + 8 + 2007 + 501 - 20 + 5 + 2
    
    N = 2530
    You get the correct answer there.

    Lets do another example, for 20/2/2008. So the date should be 20/14/2007

    Java Code:
    N = 20 + 2(14) + [3(15)/5] + 2007 + [2007/4] - [2007/100] + [2007/400] + 2
    
    N = 20 + 28 + 9 + 2007 + 501 - 20 + 5 + 2
    
    N = 2552
    Yep, I'm correct. Give the correct answer here too.

    Keep in mind that, rule only valid for January and February.

  14. #14
    veena is offline Member
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    yep i got it and did in servlet
    when i was searching i got the same formula

    any ways thnks very much
    its a nice formula though
    Last edited by veena; 05-05-2008 at 03:41 PM.

  15. #15
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    I think you can just use the Gregorian calendar I think also.
    My IP address is 127.0.0.1

  16. #16
    Eranga's Avatar
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    No matter what calender you used, my formula is working. We have used in few projects that formula, when I'm in the University.

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    Eranga's Avatar
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    Hey veena, no need to edit your post time to time. If you expecting the answer in different approaches please let it to others. Because later someone read your thread, really confused. :)

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