How To Set Time For Calendar

Mar 7, 2014

I would like to set a specific time for a Calendar instance. My below code will set a time one minute ahead of the current time, and format it to ISO8601 standard.

Java Code:

Calendar reminderDate = Calendar.getInstance();
System.out.println(dateFormat.format(reminderDate.getTime()));
reminderDate.add(Calendar.MINUTE,1);
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
String finalReminderDate = sdf1.format(reminderDate.getTime()); mh_sh_highlight_all('java');

I now want to set another variable(deadlineDate), but to a specific time, say 5 minutes ahead. I would like to hardcode this in so I dont want it to change as a result of getting the instance of the Calendar(which sets it to the current time)

Essentially I am trying to regenerate the above code every minute and increment itself each cycle until it reaches the deadlineDate, which is a fixed datetime.

How can I do this?

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String To Calendar Time

Feb 9, 2014

I'm having an issue with this little bit of conversion. I'm converting a string (_dateString) into a Calendar time. I am using DateFormat and SimpleDateFormat to accomplish this task. Everything seems to be working great, except for it figuring out whether it is AM or PM. According to SimpleDateFormat (Java Platform SE 7 ) I am using "aa" to get my AM or PM marker. How come in my output then, it believes it to be 4:45 am instead of 4:45 pm? Hour of Day should return the 24 hour clock, which should show 16 instead of 4. I have posted the output below my code.

Java Code:

import java.text.*;
import java.util.*;
public class Time{
static String _dateString = "08 Feb 2014, 4:45pm";
public static void main(String args[]){
Calendar cal=Calendar.getInstance();

[Code] ....

Output:

Java Code:

Today is Sat Feb 08 04:45:00 EST 2014
Year: 2014
Month: 1
Day of Month: 8
Day of Week: 7
Week Of Year: 6
Week of Month: 2
Hour: 4
Hour of Day: 4
Minute: 45
Second: 0
Millisecond: 0 mh_sh_highlight_all('java');

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Military Time - Adding Minutes Displaying Correct Time

Feb 9, 2015

I am working on an assignment that I can't seem to figure out the final part to. The program takes in course data such as the time the class starts and how long it lasts. The time is in military time (0000 - 2400)

I need the output time to be the time the class started, plus the length of the class, and displayed in military time.

for example,

Start Time = 0930
Length = 50 minutes
Endtime = 1020

I can't for the life of me figure out how to do this. I have gotten a program that works for this time and minutes, and displays the correct 1020. But when I change the information to say

Start time: 0700
Length = 90 minutes

I get:

Endtime = 90

90 is technically correct, the way the formula is setup, but I need it to display 0900 not 90.

Here is the code that I have. Be easy, I'm still learning, and this is just the file I created to get the formula to work. Also, the verbose in here is just for my own debugging to make sure values should be what I'm expecting them to be.

public class calc
{
public static void main(String[] args) {
double hours, minutes, length;
double temp;
int time = 2400;
hours = time / 100;
System.out.println("Hours are: " + hours);

[Code] ....

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Converting Military Time To Standard Time?

Jan 29, 2014

I have two classes. time_runner is used for testing my code.

This is what I'm using to test my code:
 
class time_runner
{
 public static void main(String str[]) throws IOException {
 Time time1 = new Time(14, 56);
System.out.println("time1: " + time1);
System.out.println("convert time1 to standard time: " + time1.convert());
System.out.println("time1: " + time1);
System.out.print("increment time1 five times: ");
time1.increment();

[code]....

The two constructors are "Time()", which is the default constructor that sets the time to 1200, and "Time(int h, int m)" Which says If h is between 1 and 23 inclusive, set the hour to h. Otherwise, set the hour to 0. If m is between 0 and 59 inclusive, set the minutes to m. Otherwise, set the minutes to 0. Those are my two constructors that I pretty much have down. The three methods however I'm having trouble with. The "String toString()" Returns the time as a String of length 4. The "String convert()" Returns the time as a String converted from military time to standard time. The "void increment()" Advances the time by one minute.

public class Time {
private int hour;
private int minute;
  public Time(int h, int m) {
if(h > 1 && h < 23)
hour = h;

[code]....

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Get Month And Year From Calendar

Aug 8, 2014

I have Georgian Calendar object

GregorianCalendar date = (GregorianCalendar)pageContext.getAttribute("datetime");
System.out.println("date :::: "+date);

It prints :

date :::: java.util.GregorianCalendar[time=1408045500000,areFieldsSet=true,
areAllFieldsSet=true,lenient=false,zone=sun.util.calendar.ZoneInfo[id="GMT+05:30",
offset=19800000,dstSavings=0,useDaylight=false,transitions=0,lastRule=null],
firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2014,MONTH=7,

[Code] ....

I want month and year from this like August 2014. How can i do the same.

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Feb 20, 2014

I've been looking online and I can find how to convert a Calendar datetype to Date, but what if I need a Date datatype to be Calendar?

I am try to count days and Date.getDay() has been deprecated.

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Calendar Code Will Not Compile

Nov 15, 2014

import java.util.Calendar;
import java.util.GregorianCalendar;
public class CalendarCalc {
public CalendarCalc (){}
private static void printCalendarMonthYear (int month, int year)

[Code] .....

IDE is telling me this:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:

The method printCalendarMonthYear(int, int) is undefined for the type CalendarDisplay

at CalendarDisplay.main(CalendarDisplay.java:46)

Btw, I have a main class. This is just the class responsible for doing calculations.

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May 25, 2014

i have a problem, i need build a calender in BlueJ. The program need to found if I put this one year have to give me the full schedule but only the first semester.

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Calendar Method Not Recognized

Mar 21, 2014

I am currently using notepad to create a Java program and using the command box to compile it and execute it and it has been working fine. I have the JDK version 7 so java.lang works which I know does not need to be imported. The Calendar method which should be recognized is not.

Here is the program. Cut this program and compile it in the command box. It will not recognize the Calendar method.

import java.util.*;
class Practice4_2
{
public static void main (String args[])
{
Calendar cal = Calender.getInstance();
Date.now = new Date();

[Code] ....

Here is my path if needed:

C:Program Files (x86)InteliCLS Client;
C:Program FilesInteliCLS Client;%SystemRoot%system32;
%SystemRoot%;%System Root%System32Wbem;%SYSTEMROOT%System32WindowsPowerShellv1.0;

[Code] ....

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Is Calendar Mutable - What The Value Was Initialized With

Jun 9, 2014

I have a field that initializes a Calendar object:

Java Code:

private Calendar zeroPointTime = zeroPointTime();
private Calendar zeroPointTime(){
int year = 2000;
int month = 0;
int date = 1;
int hourOfDay = 0;
int minute = 0;
Calendar calendarTime = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendarTime.set(year, month, date, hourOfDay, minute);

[Code] ....

But other times I need to reference what the value was initialized with, not offset values added to it with various function calls.

When I use add() will that modify zeroPointTime? If so, how can I add seconds to a Calendar object without altering its value?

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Oct 14, 2014

I created a calendar program so when the user enters a day number and a year it would show the calendar for the year . My issue was that I could not get the numbers to line up neatly and how they should look . Also if its not to much trouble I would like to know how to turn this in to a loop .

import java.util.Scanner;
public class Calendar {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter a Year");
int Year = scanner.nextInt();

[Code] .....

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Gregorian Calendar Cannot Be Converted Into Double

Dec 7, 2014

I wrote this application but somehow in my CheckingAccount, I get an error saying GregorianCalander cannot be converted into double.

The line that gives me an error is "super(name, number, openDate, balance);"

package finalproject;
import java.util.*;
import java.text.SimpleDateFormat;
public class CheckingAccount extends Account {
final SimpleDateFormat sd = new SimpleDateFormat("yyy/mm/dd");
CheckingAccount(String name, String number, GregorianCalendar openDate, double balance) {
super(name, number, openDate, balance);

[Code] .....

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Displaying Calendar For Each Month Of Given Year / Day

Feb 15, 2009

I'm working on a program that prompts the user to enter the year and first day of the year and displays the calendar table for that year on the console. For example, if the user entered the year 2005, and 6 for Saturday, Juanuary,1, 2005, the program should then display the calendar for each month of the year.

I have written the program and solved the problem for the most part. Only, I'm having terrific difficulty getting the output to properly format. I'm *almost* there. I'll post my program below and then output.

import java.util.Scanner;
public class DisplayCalendar {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the year: ");
int year = scanner.nextInt();

[Code] ....

___________________________________________
SunMonTueWedThuFriSat
1
2 3 4 5 6 7 8
9 10 11 12131415
16 17 18 19202122
23 24 25 26272829
30 31

February 2005
____________________________________________
SunMonTueWedThuFriSat
1 2 3 4 5
6 7 8 9 101112
13 14 1516171819
20 21 2223242526
27 28

See, my spacing is all off.

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JSP :: Show Reminders On A Particular Date On Calendar

May 20, 2014

I am working on an application using JSP and SERVLET.

Somewhere I need to show the reminders on a particular date on calendar (Jsp page). I have used javascript for calendar and entering reminder from another UI. So I need to display an image on the calendar date which is matching with reminder date. The problem is how can I display the image on that date which is on calendar.

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Jul 11, 2014

I was trying this sample java calendar program.

[URL] ....

How can I make popup window, which shows the date value when I click a date?

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Printing Gregorian Calendar Default Constructor?

Sep 20, 2014

I am having trouble with getting output to be what I want. I can get the output when a user enters their values for month, day and time using a scanner object and they print correctly, but what I want is before they input values, to display the current date. Here is a snippet of what I am working with *these are in two separate files, the first has all the variables etc, the second has the main method.

In one java file:

Java Code:

private int numOfGuests, month, day, year;
private GregorianCalendar eventDate = new GregorianCalendar();
public Event()
{
this("not assigned" , 0, new GregorianCalendar());
}
public int getDay() {

[Code] ....

This gives me 0-0-0 as a result instead of current date.

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Jun 20, 2014

I have a problem to display a popup with the information of the registered event. I would like the user to hover over a particular event exhibited only the description of the event without having to click on the event to view information. I would like to make an ajax request to that was displayed a popup.

But do not know how to implement jquery and javascript. Well, I am new to programming. My code that generates the schedule is as follows:

<p: schedule value = "#{bean.datamodel}" widgetVar = "sheldule" locale = "en"
rightHeaderTemplate = "prev, next" leftHeaderTemplate = "today" centerTemplate = "month"
id = "events"
tooltip = "true">
<p:ajax event="dateSelect" listener="#{bean.onDateSelect}" update="eventsNew" oncomplete="eventDialog.show();"/>
<p:ajax event="eventSelect" listener="#{bean.onEventSelect}" update="eventsNew" oncomplete="eventDialog.show()"/>
</ p: schedule>

In my Bean have methods that make the selection of date and event. Have I configured the option of setEditable to true. Ajax function, jquery or javascript to show the popup containing only observation and event date. And looked at the documentation of primefaces and not found any implementation to solve my problem.

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Sep 18, 2014

I am writing a short program to find the zodiac of a given birth date. I am checking to see if a calendar object falls between to other objects to see if the date falls within a certain zodiac sign. To accomplish this, I have the user enter a date, then that date is compared to dates taken from an array. The problem is sometimes the comparison doesnt seem to work work, giving the wrong zodiac. For example if I enter 03/28/1968, it finds Aries, as expected. However if I enter 03/20/1968, it returns Aries also, when it should return Pisces. Here is the sample code.

private static String determineSign(Date birthdate, String[][] zodiac) throws ParseException {
// TODO Auto-generated method stub
Date date = birthdate;
for (int row = 0; row < zodiac.length; row++)
{
DateFormat date3 = new SimpleDateFormat("MM/dd");
Calendar compDate3 = Calendar.getInstance();

[Code] .....

This is the class that creates the table used for the zodiac dates -

public class ZodiacTable {
static final int ROWS = 12;
static final int COLUMNS = 3;
//private ArrayList<String> zodiacNames;
private String[][] zodiacNames;

[Code] ....

I cant seem to see why it returns the wrong zodiac..

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Nov 24, 2014

I have a PrimeFaces page with a calendar component on it. Radio buttons on that page work fine and call the setter method on the back end. The Calendar however doesn't call the setter. The getter method is called on page display.I'm using the PrimeFaces v 5.0 jar file.

<h:panelGrid columns="4" cellspacing="5">
<p:radioButton id="timeframeOpt10" for="searchTimeframe" itemIndex="10" style="padding-left:30px;"
onchange="document.getElementById('_listenerportlet_WAR_listenerportlet_:articleSearchForm:tabView:timeframeChecked').innerHTML = '(#{i18n['timeframe-specify-dates-label']})';" />
<h:outputLabel value="#{i18n['timeframe-specify-dates-label']}" style="padding-left:10px;" />
<h:panelGrid columns="2" style="align-content:center;">
<p:outputLabel value="#{i18n['timeframe-dates-start-label']}" />
<h:outputText value=" " />
<p:calendar value="#{articleSearchFormBean.timeframeStart}" showOn="button" />
</h:panelGrid>
<h:panelGrid columns="2">

[code].....

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Oct 25, 2014

I need to add a few days to make an end date (for instance the start date is the first date selected, and then the end date is x amount of days after that... I think I should be using the add() method but I am not quite sure of where or how to do so)...

Java Code:

//Get an instance of Calendar and DateFormat class, and get current date from the system using OnClick method
Calendar startVacation = Calendar.getInstance();
DateFormat fmtDate = DateFormat.getDateInstance();
DatePickerDialog.OnDateSetListener startVaca = new DatePickerDialog.OnDateSetListener() {

[Code] .....

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Apr 4, 2014

Every year, she has to plan when her employee's can go on vacation for the summer holidays - MANUALLY. It takes weeks to solve the puzzle, because she has several kinds of employee's hired, with different skills. And at all days there must be X amount of employees with skill1 at work, plus Y amount of employees with skill2 etc, and they also need special "off-days" in comparison to when they last worked and so on. It's quite the math puzzle.

I've worked a little with C#, and built a prototype of a Support System (Ticket based), so I got the basics down of programming, and I know Java and C# are quite alike, so I don't think making the switch will bother me that much.

The program should be easy to use for her, so it needs a visual calender that can be interacted with, and it should also be easy to see which employee is at work at that date and so on.

Will it be hard for me to build this kind of Calender, that allows the interaction I want?

Any open-sourced projects, or libraries that will make my task easier?

I plan on using NetBeans IDE for this project.

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Oct 14, 2014

I have a requirement to find the greatest/maximum of the given list of Calendar objects in Java.

i.e., 2013/01/26
2014/03/03
2012/02/27
2014/01/15

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Sep 22, 2014

I'm a Java beginner and I'm having issues implementing Java's GregorianCalendar into my project. I'm writing to specific test code that passes arguments into an instantiated GregCal class. My problem is that I'm not sure how to pass the arguments through to my constructors and methods, or if I'm even supposed to do that at all. Date formatting is another issue, but I'll be glad If I can just get the dates in and back out. Here is some of the code:

Test code:
// Create a Student using the default constructor
Student newStudent = new Student();
GregorianCalendar dateOfBirth = new GregorianCalendar(75,7, 3);
newStudent.setDateOfBirth(dateOfBirth);
GregorianCalendar dateOfGraduation = new GregorianCalendar(90, 6, 10);
newStudent.setDateOfGraduation(dateOfGraduation);

Setter:
public void setDateOfBirth (GregorianCalendar dateOfBirth){
this.dateOfBirth = dateOfBirth;
}

I know that's not much to work with, but that's exactly my issue. I can't seem to find a reliable and UNDERSTANDABLE tutorial for java.util.GregorianCalendar anywhere. All of the existing documentation is beyond my grasp at this point. I'm assuming I need to declare and initialize MONTH, DAY, YEAR variables somewhere in order for the arguments to be passed through correctly. I'm just not sure where or how.

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Oct 17, 2014

The instructions state: Create the following values for the enum (and make sure that they are spelled correctly, case matters):

a. SUN
b. MON
c. TUE
d. WED
e. THU
f. FRI
g. SAT

Create a private constructor for the Day enum that takes a boolean value. This boolean will determine if the day is a weekday (if it is true) or weekend (if it is false). Document it with a JavaDoc. This value will need to be stored as part of the object. Update the enum values so that they correctly call the constructor. Saturday and Sunday are the only days considered part of the weekend.

Implement the following methods:
a. boolean isWeekday()
i. Returns true if the day is a weekday.

b. Boolean isWeekend()
i. Returns true if the day is a weekend. (How could you determine that?)

c. String toString()
i. Returns the full name of the day for the enum value (i.e. Monday or Tuesday). Use either a set of nested ifs or a switch statement.

Hint: You will want to compare the this reference against the possible values in the enum.

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Jan 27, 2015

I am using the calendar component of the primefaces and I am using the attribute pattern="MM/dd/yyyy.But when I print the values in my MBean along with the selected date event the timeZone (i think) is printed as Sun Mar 29 00:00:00 IST 2015 I do not understand why its printed even though I have set the pattern.Part of my code :

XHTML

<p:calendar id="singleDaySchedule" value="#{scheduleMBean.exactDate}"
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[Code] ....

I found out that we need to use <f:convertDateTimePattern> instead of how I am using currently.But I am not able to figure out where to use

<f:convertDateTimePattern>

in my case

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Java-8 :: Calendar Class GetDisplayName Method - Month March Be Repeated 2 Times

Mar 30, 2015

Operating System = Windows 7 version 6.1 running on amd64
Java; VM; Vendor = 1.8.0
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.0-b70
 
Detect a bug in Java, specifically in the Calendar class will getDisplayName method. I put in the message code showing the error. If the code is executed you can see that the month March be repeated 2 times jumping the month of February.
 
Code Example:
 
import java.util.Calendar;
import java.util.Locale;
 public class BugInCalendarDisplayName {
  public static void main(String[] args) {
    Calendar aMonth = Calendar.getInstance();
    aMonth.set(Calendar.MONTH, 0);

[Code] ....
 
Obtained results of the code execution:
 
ENERO
MARZO
MARZO
ABRIL
MAYO
JUNIO
JULIO
AGOSTO
SEPTIEMBRE
OCTUBRE
NOVIEMBRE
DICIEMBRE

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