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Java Data Type Q&A
9.Date Time
10.Date Time Format
19.Number Format
Java Data Type Q&A » Calendar » day 
<% } %> <% if (day == Calendar.SATURDAY) { %> <% } %> <% } //close days %> <% //close each month %>

1. Anyone know a simple way using java calendar to subtract X days to a date?

Anyone know a simple way using java calendar to subtract X days to a date? Sry not being able to find any function which allows me to directly subtract X days to ...

2. Getting Day from a Date Object

I wanna see if someDate has any day in it. Am I checking it right?

Calendar cal = Calendar.getInstance();
cal.setTime(someDate); // someDate is a Date
int day = cal.get(Calendar.DAY_OF_MONTH);
if(day == 0){
  // code ...

3. Subtracting days in a Calendar object

I need to minus 365 days in a given date (givenDate)-

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, -365);  
Am I right?

4. JCalendar: how to change the foreground color of certain days?

i'm using the JCalendar v 1.3.3 component and i want to change the foreground color of certain days, by default the present days has red foreground, i want to ...

5. Advance Calendar day by x amounts

Is there any difference between the following operations? (Advance current date to 160 days)

    Calendar c = Calendar.getInstance();
    c.add(Calendar.DAY_OF_WEEK, 160);


6. Day of birth program

Here's what I have so far: it's a program that asks the user to enter the month, day, and year of birth in separate showInputDialog boxes. What I'm having a problem ...

7. How get the next and previuos day in java Calendar?

How get the next and previuos day in java Calendar?

8. Can I derive the number of days since Jan 1 1900 for a given `Date` using just the `java.*` API?

Spreadsheets (MS Excel, Google Apps) represent dates as the number of whole days since Jan 1 1900 (possibly caveat a Feb 29 odditiy in Excel's case). OK, so ...

9. Java Calendar set time to 12am of previous day in UTC

Can someone explain why or if this code is wrong?

// main
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendar.add(Calendar.DATE, -1);
calendar.set(Calendar.HOUR_OF_DAY, 0);
It produces:
Fri Jan 28 15:27:35 EST 2011
Thu Jan 27 15:27:35 EST 2011
Wed Jan 26 19:27:35 EST ...

10. Calculating days between certain dates with certain days being excluded using java Calendar

I'm trying to come up with a way to calculate the number of days between two different dates, however there will be certain days of the week that are only to ...

11. Java Date (Calendar) calculating the start of a day in local time given a date time

All, Having a hard day in the office with this one... I am trying to workout the start of a day in Local Time, i.e. Midnight 00:00:00, given any calendar date. Given ...

12. Calendar.set(HOUR_OF_DAY, 1) confusion

I am puzzled by some GregorianCalendar behavior. The code in question: import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.GregorianCalendar; import java.util.TimeZone; public class CalendarTest { public static void main( String args[] ) { SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" ); long utc = Long.parseLong( "1196732402000" ); GregorianCalendar calendar = new GregorianCalendar(); calendar.clear(); calendar.setTimeInMillis( utc ); calendar.setTimeZone( TimeZone.getTimeZone( "GMT" ) ); System.out.println( "A. ...

13. Regarding Calendar.HOUR_OF_DAY

14. Rolling forward days in a calendar

Hi everyone, I'm writing my own calendar class and one of the methods I have to supply is the ability to roll the calendar date forward or backward by a given number of days. I'm not really sure how to go about doing this. One way I was thinking was to write a method that adds one day to the date ...

15. How to set current day (today) background color in Calendar?

I dont know how to set colour current day's button in Calendar. Java Code: if (x==today) { button[x].setBackground(; } The code above doesnt work correct. I browsed many webites but dont find any what would help. Full code of the class: Java Code: package lars; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; class DatePicker { Calendar cal = Calendar.getInstance(); int ...

16. Current Day in Calendar

I have a problem with setting a colorful background in "current day of month" button in Calendar. I used many ways to do this but the result is always the same. It's really irritating. I tried to get an effect by this code below: Java Code: GregorianCalendar cal = new GregorianCalendar(year, month, 1); int dayOfWeek = cal.get(java.util.GregorianCalendar.DAY_OF_WEEK); int today = cal.get(java.util.GregorianCalendar.DAY_OF_MONTH); ...

17. Calendar puzzle, 23 hour day?

18. Calendar Work Days (only weekend)

19. Calendar doesn't know what day it is

One of your problems is with how you try to parse the date string. The manual way that you are doing it will take the month number (4) and assign the date the month of May, since calendar uses a 0 base for months (0 represents January). I think that May 4th, 2008 is in fact a Monday. I recommend that ...

20. calendar off by 1 day

for(int b = 0; b < days; b++){ annivCal.add(Calendar.DAY_OF_MONTH, 1); int day = annivCal.get(Calendar.DAY_OF_WEEK); if (day == Calendar.SUNDAY){ %>

<% if(m == 2 || m == 5 || m == 8) { //go ...

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