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

StringgetDayOfWeekAsString(String sYear, String sMonth, String sDay)
get Day Of Week As String 
Calendar cd = new GregorianCalendar(Integer.parseInt(sYear), Integer.parseInt(sMonth) - 1,
        Integer.parseInt(sDay));
SimpleDateFormat sdf = new SimpleDateFormat("EEE", Locale.KOREA); 
Date d1 = cd.getTime();
return sdf.format(d1);
intgetDayofWeekByDay(String year, String month, String day)
get Dayof Week By Day 
Calendar calendar = Calendar.getInstance(Locale.UK);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setMinimalDaysInFirstWeek(4);
calendar.set(Calendar.YEAR, Integer.parseInt(year));
calendar.set(Calendar.MONTH, Integer.parseInt(month) - 1);
calendar.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day));
long milltimes = calendar.getTimeInMillis();
calendar.setTimeInMillis(milltimes);
...
DategetDayofWeekForContainedDate(Date dt, DayOfWeek dow)
Find the day of week within the week that the dt is part of. 
LocalDate dtLocalDate = dateToSystemLocalDate(dt);
LocalDateTime dtLocalDateTime = dtLocalDate.atStartOfDay();
dtLocalDate = dtLocalDateTime.toLocalDate();
Date retDate;
if (isDayOfWeek(dtLocalDate, dow)) {
    retDate = localDateToSystemAdjustedStartOfDayDate(dtLocalDate);
} else {
    int dtVal = dtLocalDateTime.getDayOfWeek().getValue();
...
IntegergetDaysByWeek(Integer month, Integer year, Integer week)
get Days By Week 
Integer num = null;
Calendar c = Calendar.getInstance();
c.set(year, month - 1, 1);
int mountDay = c.getActualMaximum(Calendar.DAY_OF_MONTH);
num = mountDay / 7;
int yu = mountDay % 7;
for (int i = 1; i <= yu; i++) {
    c.set(Calendar.DAY_OF_MONTH, i);
...
MapgetDaysByWeek2(Integer month, Integer year, Integer begin)
get Days By Week 
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
Calendar c = Calendar.getInstance();
c.set(year, month - 1, 1);
for (int i = 1; i < begin; i++) {
    c.set(Calendar.DAY_OF_MONTH, i);
    if (1 == c.get(Calendar.DAY_OF_WEEK)) {
        Integer value = map.get(1) == null ? 0 : map.get(1);
        map.put(1, value + 1);
...
DategetDayWeekDate(String dateStr)
get Day Week Date 
try {
    return getDateFromString(dateStr, "dd MMM yyyy' 'HH:mm");
} catch (Exception ex) {
    Calendar resultCalendar = Calendar.getInstance();
    resultCalendar.setTime(getDateFromString(dateStr, "EEE dd MMM' 'HH:mm"));
    resultCalendar.set(Calendar.YEAR, Calendar.getInstance().get(Calendar.YEAR));
    return resultCalendar.getTime();
StringgetDayWeekDateStr(Date date)
get Day Week Date Str 
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
if (Calendar.getInstance().get(Calendar.YEAR) != calendar.get(Calendar.YEAR))
    return getDateStr(date, "dd MMM yyyy' 'HH:mm");
else
    return getDateStr(date, "EEE dd MMM' 'HH:mm");
DategetEndOfWeek(Date date)
Gets the end of week. 
return getWeek(date)[1];
DategetFirstDayOfLastWeek(Date date)
get First Day Of Last Week 
Calendar c = Calendar.getInstance();
c.setTimeInMillis(date.getTime() - 604800000L);
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
Date lastWeekDate = c.getTime();
c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
...
intgetFirstDayOfWeek(int year, int week)
get First Day Of Week 
Calendar c = Calendar.getInstance(Locale.US);
c.set(year, 1, 1, 0, 0, 0);
c.set(Calendar.WEEK_OF_YEAR, week);
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
int dayOfYear = c.get(Calendar.DAY_OF_YEAR);
if (c.get(Calendar.YEAR) < year) {
    Calendar x = Calendar.getInstance(Locale.US);
    x.set(c.get(Calendar.YEAR), 11, 31, 0, 0, 0);
...