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Java Data Type Q&A » Calendar » add 

1. Calendar add() vs roll() when do we use it?    stackoverflow.com

I know add() adds the specified (signed) amount of time to the given time field, based on the calendar's rules. And roll() adds the specified (signed) single unit of time on the ...

2. add more than 30 days with Calendar's add() method in Java    stackoverflow.com

I'm not quite sure what field to use when adding more than 30 days to a Java Calendar object. Is there any difference in between Calendar.DAY_OF_MONTH and Calendar.DAY_OF_YEAR? Example:

GregorianCalendar d = new ...

3. roll() and add()    stackoverflow.com

what is the diference between roll() and add() in java ? /*this the class that i wanted to see if i can use add in place of roll . and thank you ...

4. Add 1 Week to a Date, which way is preferred?    stackoverflow.com

I am reviewing some code at work and came across an inconsistency in how the code handles adding 1 week to the current time and was wondering if there was any ...

5. How to add long value to calendar?    stackoverflow.com

Calendar's add method in Java takes an integer as an input

int secs = 3;
cal.add(Calendar.SECOND, secs);
But what if the seconds are Long type. long secs = 3 There's quite a few possibilities like adding ...

6. Add year to Java Calendar doesn't work    stackoverflow.com

Please enlight me on this : I'm simply trying to add 10 years to the current date then substract an expiration date from it to return the number of years:

public int getMaxYears() ...

7. Adding one week via java.util.Calendar.add() fails    stackoverflow.com

I'm trying to iterate in my Java program over all weeks between two dates (the end date being today). First, I get the starting date:

Calendar start = Calendar.getInstance();
start = data.getFirstDate(users, threads);
So ...

8. Java - Add specified number of Dates to a date    stackoverflow.com

There are two date variables (Date1 and Date2) in the format YYYYMMDD. What i want is, according to the Date1 I want to set Date2 to the next month day one. ...

9. Gregarion Calendar causing problem when adding dates.....    coderanch.com

output of incrementing below date 20050530 (30th April)by 1 is 31st April instead of 1st May 2005 ?? Any explaination ? import java.text.ParseException; import java.util.*; import java.io.*; public class TestPgm { public TestPgm() { } public static void main(String[] arg) throws ParseException { TestPgm t = new TestPgm(); t.extractDate("20050430"); } public String extractDate(String xml_file_date)//20040728S { //String tempDate = latestFileName.substring(9,17).trim(); int yrIndex ...

10. Adding days to Calendar    coderanch.com

Create a new instance of GregorianCalendar and set the date and time of the new instance to the same as the old one (lookup the API documentation for the methods you need). Then add the number of days to the new one by using the add() method. [ June 09, 2006: Message edited by: Jesper Young ]

11. Calendar.add not working..    coderanch.com

12. add method of Calendar    coderanch.com

I have this code: Calendar oneYearLater = new GregorianCalendar(); oneYearLater.add(Calendar.YEAR, 1); The first line gets today's date. The second line should change the value, but it isn't doing it. I am running Drools in debug mode, and the value of the field doesn't change from one line to the next. What am I doing wrong? I have also tried this: Calendar ...

13. add 10 days to currentDate in java.util.Date or cast to Calendar?    coderanch.com

You cannot cast a Date to a Calendar, or a Calendar to a Date, because those two classes are not related in the class hierarchy. Trying to cast one into the other will lead to a ClassCastException. Class Calendar contains setTime() and getTime() methods to set the Calendar to the date and time of a Date object, or to get a ...

14. Java Calendar - add    coderanch.com

Usage model. To motivate the behavior of add() and roll(), consider a user interface component with increment and decrement buttons for the month, day, and year, and an underlying GregorianCalendar. If the interface reads January 31, 1999 and the user presses the month increment button, what should it read? If the underlying implementation uses set(), it might read March 3, 1999. ...

16. Adding 1 to MONTH of calendar instance    forums.oracle.com

17. Adding days to a calendar date    forums.oracle.com

/* try { // get the connection Connection dbCon=new DbConnection().getConnection(); // Create a Statement Statement stmt = dbCon.createStatement(); // set the timeout here so that we don't get overlapping statements stmt.setQueryTimeout(2); // run the update/insert stmt.executeUpdate(query.toString()); stmt.close(); dbCon.commit(); dbCon.close(); } catch (SQLException se){ session.setAttribute("errMessage","SQL Error: "+se); } catch (Exception e){ session.setAttribute("errMessage","General Exception: "+e); } finally { // TODO: Finally statement } ...

19. Add date on Calendar    forums.oracle.com

I try to create the code below. today is 7/2/07, but when I -2 days it shows 6/31/07. but there is no such a date. what do I do to make it go to 6/30/07? Calendar now = Calendar.getInstance(); Calendar calendar; calendar = (Calendar) now.clone(); //date of calendar is 6/2/07 calendar.add(Calendar.MONTH, 1); //date of calendar is 7/2/07 calendar.add(Calendar.DAY_OF_YEAR, -2); //date of ...

20. Calendar add question    forums.oracle.com

21. Calendar.add for Central African Timezone (GMT +2)    forums.oracle.com

// Create a date set the Time to 1900/01/01 06:00 AM Calendar now = Calendar.getInstance(); now.set(1900, 0, 1, 6, 0, 0); Date d = new Date(now.getTimeInMillis()); System.out.println(d.toString()); System.out.println(); // try to add 1154 days to d with GMT timezone Date d2 = addDaysWithGMT(d, 1154); System.out.println("Extra two hours: " + d2.toString()); System.out.println(); // try to add 1154 days to d with original ...

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