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

booleanisWeekend(Date date)
Check if the date parameter occurs during a weekend. 
if (date != null) {
    Calendar calendar = Calendar.getInstance();
    calendar.setFirstDayOfWeek(Calendar.MONDAY);
    calendar.setTime(date);
    int dayOfTheWeek = calendar.get(Calendar.DAY_OF_WEEK);
    return dayOfTheWeek == Calendar.SATURDAY || dayOfTheWeek == Calendar.SUNDAY;
} else {
    return false;
...
booleanisWeekend(Date dt)
Check whether a date is a weekend 
return isSaturday(dt) || isSunday(dt);
booleanisWeekEnd(Date in)
is Week End 
if (in == null) {
    return false;
GregorianCalendar cal = new GregorianCalendar();
cal.setTime(in);
return cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY
        || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY;
booleanisWeekend(final Date date)
is Weekend 
final Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
return calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY
        || calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY;
booleanisWeekendDay(final DayOfWeek nDayOfWeek)
is Weekend Day 
return nDayOfWeek == DayOfWeek.SATURDAY || nDayOfWeek == DayOfWeek.SUNDAY;
booleanisWork(String weekday, Date date)
is Work 
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int week = (calendar.get(Calendar.DAY_OF_WEEK) - 2 + 7) % 7;
return "1".equals(weekday.substring(week, week + 1));
DayOfWeekjavaCalendarToNewTimeApi(int dayOfWeek)
The method is intended to convert Calendar day of week to DayOfWeek . 
switch (dayOfWeek) {
case Calendar.MONDAY:
    return DayOfWeek.MONDAY;
case Calendar.TUESDAY:
    return DayOfWeek.TUESDAY;
case Calendar.WEDNESDAY:
    return DayOfWeek.WEDNESDAY;
case Calendar.THURSDAY:
...
DatemergeDayIntoDate(Date baseDate, int dayOfWeek)
Calculate a new date for a certain day of week and hour of day. 
final Calendar c = GregorianCalendar.getInstance();
c.setTime(baseDate);
if (dayOfWeek != -1) {
    c.set(Calendar.DAY_OF_WEEK, dayOfWeek);
return c.getTime();
CalendarnextDayOfWeek(Date fromDate, int dow)
next Day Of Week 
Calendar instance = Calendar.getInstance();
if (fromDate != null) {
    instance.setTime(fromDate);
if (dow > 0 && dow < 8) {
    int diff = dow - instance.get(Calendar.DAY_OF_WEEK);
    if (!(diff >= 0)) {
        diff += 7;
...
DatenextWeek(Date date)
next Week 
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
calendar.add(Calendar.WEEK_OF_YEAR, 1);
return calendar.getTime();