How to use

setTime

method

in

java.util.Calendar

  @Override
  public Calendar convert(Date source) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(source);
    return calendar;
  }
}

 String dt = "2008-01-01";  // Start date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(sdf.parse(dt));
c.add(Calendar.DATE, 1);  // number of days to add
dt = sdf.format(c.getTime());  // dt is now the new date

 Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal1.setTime(date1);
cal2.setTime(date2);
boolean sameDay = cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
         cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR);

 java.util.Date date= new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int month = cal.get(Calendar.MONTH);

 String myDateString = "13:24:40";
//SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");
//the above commented line was changed to the one below, as per Grodriguez's pertinent comment:
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
Date date = sdf.parse(myDateString);

Calendar calendar = GregorianCalendar.getInstance(); // creates a new calendar instance
calendar.setTime(date);   // assigns calendar to given date 
int hour = calendar.get(Calendar.HOUR);
int minute; /... similar methods for minutes and seconds

@Test
public void testCalendar() {
  Date d = new Date(0);
  Calendar cal = Calendar.getInstance();
  cal.setTime(d);
  assertThat(jdkTypeToJson(cal), containsString(new SimpleDateFormat("yyyy-MM-dd").format(d)));
}

private Calendar calExpiredTime() {
 Calendar calendar = Calendar.getInstance();
 calendar.setTime(DateUtils.addHours(new Date(), portalConfig.survivalDuration()));
 return calendar;
}

 Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy", Locale.ENGLISH);
cal.setTime(sdf.parse("Mon Mar 14 16:02:37 GMT 2011"));// all done

  String computeTimeStampString(long now) {
    synchronized (this) {
      // Since the formatted output is only precise to the second, we can use the same cached string if the
      // current
      // second is the same (stripping off the milliseconds).
      if ((now / 1000) != lastTimestamp) {
        lastTimestamp = now / 1000;
        Date nowDate = new Date(now);
        calendar.setTime(nowDate);
        timesmapStr = String.format("%s %2d %s", simpleMonthFormat.format(nowDate), calendar.get(Calendar.DAY_OF_MONTH),
                simpleTimeFormat.format(nowDate));
      }
      return timesmapStr;
    }
  }
}

 SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
Date convertedDate = dateFormat.parse(date);
Calendar c = Calendar.getInstance();
c.setTime(convertedDate);
c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));

calendar.setTime(date);
calendar.set(Calendar.MILLISECOND, 0);
long originalTimestamp = calendar.getTimeInMillis();
doNext(calendar, calendar.get(Calendar.YEAR));
  calendar.add(Calendar.SECOND, 1);
  doNext(calendar, calendar.get(Calendar.YEAR));
return calendar.getTime();

/**
 * Returns true if the given calendar matches
 */
boolean check(Calendar cal) {
  Calendar checkCal = cal;
  if(specTimezone != null && !specTimezone.isEmpty()) {
    Calendar tzCal = Calendar.getInstance(TimeZone.getTimeZone(specTimezone));
    tzCal.setTime(cal.getTime());
    checkCal = tzCal;
  }
  if(!checkBits(bits[0],checkCal.get(MINUTE)))
    return false;
  if(!checkBits(bits[1],checkCal.get(HOUR_OF_DAY)))
    return false;
  if(!checkBits(bits[2],checkCal.get(DAY_OF_MONTH)))
    return false;
  if(!checkBits(bits[3],checkCal.get(MONTH)+1))
    return false;
  if(!checkBits(dayOfWeek,checkCal.get(Calendar.DAY_OF_WEEK)-1))
    return false;
  return true;
}

private static int getWithMondayFirst(final Date date, int field) {
  Validate.notNull(date, "The date must not be null");
  Calendar cal = Calendar.getInstance();
  cal.setFirstDayOfWeek(Calendar.MONDAY);
  cal.setTime(date);
  return cal.get(field);
}

protected Date calculateDueDate(CommandContext commandContext, int waitTimeInSeconds, Date oldDate) {
 Calendar newDateCal = new GregorianCalendar();
 if (oldDate != null) {
  newDateCal.setTime(oldDate);
 } else {
  newDateCal.setTime(commandContext.getProcessEngineConfiguration().getClock().getCurrentTime());
 }
 newDateCal.add(Calendar.SECOND, waitTimeInSeconds);
 return newDateCal.getTime();
}

 Calendar c = Calendar.getInstance(); 
c.setTime(dt); 
c.add(Calendar.DATE, 1);
dt = c.getTime();

 Date date = new Date();   // given date
Calendar calendar = GregorianCalendar.getInstance(); // creates a new calendar instance
calendar.setTime(date);   // assigns calendar to given date 
calendar.get(Calendar.HOUR_OF_DAY); // gets hour in 24h format
calendar.get(Calendar.HOUR);        // gets hour in 12h format
calendar.get(Calendar.MONTH);       // gets month number, NOTE this is zero based!

Date date; // your date
 Calendar cal = Calendar.getInstance();
 cal.setTime(date);
 int year = cal.get(Calendar.YEAR);
 int month = cal.get(Calendar.MONTH);
 int day = cal.get(Calendar.DAY_OF_MONTH);
 // etc.

 public static void main(String[] args) throws ParseException {

  DateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
  Date lastDec2010 = sdf.parse("31/12/2010");

  Calendar calUs = Calendar.getInstance(Locale.US);       
  calUs.setTime(lastDec2010);

  Calendar calDe = Calendar.getInstance(Locale.GERMAN);       
  calDe.setTime(lastDec2010);

  System.out.println( "us: " + calUs.get( Calendar.WEEK_OF_YEAR ) ); 
  System.out.println( "de: " + calDe.get( Calendar.WEEK_OF_YEAR ) );
}

@Test
public void deepCopy_calendar() {
 Calendar calendar = Calendar.getInstance();
 calendar.setTime(new Date());
 assertThat(copy(calendar), is(equalTo(calendar)));
}

String strThatDay = "1985/08/25";
SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
Date d = null;
try {
 d = formatter.parse(strThatDay);//catch exception
} catch (ParseException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
} 
Calendar thatDay = Calendar.getInstance();
thatDay.setTime(d); //rest is the same....