Java Utililty Methods Day of Week

List of utility methods to do Day of Week

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Description

The list of methods to do Day of Week are organized into topic(s).

Method

ListgetWeekDayOfYear(Date date)
get Week Day Of Year 
Calendar calendar = getCalendarFromDate(date);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setMinimalDaysInFirstWeek(DAYS_OF_A_WEEK);
int week = calendar.get(Calendar.WEEK_OF_YEAR);
int year = calendar.get(Calendar.YEAR);
List<Date> result = new ArrayList<Date>();
result.add(getDateOfYearWeek(year, week, Calendar.MONDAY));
result.add(getDateOfYearWeek(year, week, Calendar.TUESDAY));
...
StringgetWeekDays(String _date, int _amount)
get Week Days 
String res;
int year = Integer.parseInt(_date.substring(0, 4));
int month = Integer.parseInt(_date.substring(4, 6));
int day = Integer.parseInt(_date.substring(6, 8));
Calendar wCal = Calendar.getInstance();
wCal.set(year, month - 1, day);
wCal.add(Calendar.DATE, _amount);
year = wCal.get(Calendar.YEAR);
...
intgetWeekDaysBetween(Date fromDate, Date toDate, int dayOfWeek)
get Week Days Between 
int result = 0;
Date firstDate = getFirstWeekdayBetween(fromDate, toDate, dayOfWeek);
if (firstDate == null) {
    return 0;
Calendar aDay = Calendar.getInstance();
aDay.setTime(firstDate);
while (aDay.getTime().before(toDate)) {
...
DategetWeekEnd(Date date, int w)
get Week End 
Calendar c = Calendar.getInstance();
c.setTime(date);
int dayOfWeek = c.get(Calendar.DAY_OF_WEEK) - 1;
if (dayOfWeek == 0) {
    dayOfWeek = 7;
c.add(Calendar.DATE, -dayOfWeek + 7);
c.add(Calendar.WEEK_OF_MONTH, w);
...
DategetWeekFirstDay(Date weekday)
get Week First Day 
Calendar cal = Calendar.getInstance();
cal.setTime(weekday);
if (cal.get(cal.DAY_OF_WEEK) == 1) {
    cal.add(cal.DATE, -6);
} else {
    cal.add(cal.DATE, 2 - cal.get(cal.DAY_OF_WEEK));
return cal.getTime();
...
StringgetWeekID(Date dateValue)
get Week ID 
String strWeekID = "";
Calendar objCalendar = Calendar.getInstance();
objCalendar.setTime(dateValue);
int iYear = objCalendar.get(Calendar.YEAR);
int iWeek = objCalendar.get(Calendar.WEEK_OF_YEAR);
if (iWeek >= 10) {
    strWeekID = iYear + String.valueOf(iWeek);
} else {
...
StringgetWeekNum(Date date)
get Week Num 
Calendar c = Calendar.getInstance(Locale.CHINA);
c.setTime(date);
String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
return week;
longgetWeekNumber(Date date)
get Week Number 
long retVal = 0;
if (date != null) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
        calendar.add(Calendar.DAY_OF_YEAR, -1);
    calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
...
IntegergetWeekNumber(Date date, Integer day)
get Week Number 
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.WEEK_OF_MONTH) + day;
intgetWeekNumberFromDate(Date date)
Compute the week number of parameter date 
if (date != null) {
    Calendar calendar = Calendar.getInstance();
    calendar.setFirstDayOfWeek(Calendar.MONDAY);
    calendar.setTime(date);
    return calendar.get(Calendar.WEEK_OF_YEAR);
} else {
    return 0;