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

intdayOfWeek(int dayMark)
day Of Week 
return dayOfWeek(getYearOfDayMark(dayMark), getMonthOfDayMark(dayMark), getDayOfDayMark(dayMark));
intdayOfWeek(int year, int month, int day)
Day of week. 
if (month == 1 || month == 2) {
    month += 12;
    year--;
return (day + 2 * month + 3 * (month + 1) / 5 + year + year / 4 - year / 100 + year / 400) % 7 + 1;
StringdayOfWeekFromInt(final int theDay)
Conversion utility for getting a print friendly string representation of a day of the week from a numeric between 1 and 7. 
if (theDay > 7 || theDay < 1) {
    throw new IllegalArgumentException("Argument theDay is not in range of 1 to 7");
switch (theDay) {
case 1:
    return "Sunday";
case 2:
    return "Monday";
...
StringdayOfWeekFromInteger(String aDay, boolean longName)
day Of Week From Integer 
if (aDay == "1") {
    return longName ? "Sunday" : "Sun";
if (aDay == "2") {
    return longName ? "Monday" : "Mon";
if (aDay == "3") {
    return longName ? "Tuesday" : "Tue";
...
String[]dayOfWeekNames()
Public method dayOfWeekNames() returns an array of the names for days of a week in the default locale. 
return dayOfWeekNames;
CalendarendOfWeek(Date inDate, TimeZone timeZone)
Calculate the start of the week for the given date. 
Calendar c1 = Calendar.getInstance(timeZone);
c1.setTime(inDate);
Calendar c2 = Calendar.getInstance(timeZone);
c2.clear();
int daysToAdd = 8 - isoDayOfWeek(c1.get(Calendar.DAY_OF_WEEK));
c2.set(c1.get(Calendar.YEAR), c1.get(Calendar.MONTH), c1.get(Calendar.DAY_OF_MONTH) + daysToAdd);
return c2;
intextractDayOfWeek(Date date)
Extract the day of the week from a Date instance. 
Calendar cal = Calendar.getInstance();
cal.setTime(date);
return cal.get(Calendar.DAY_OF_WEEK);
DayOfWeekfindDayOfWeek(String threeLetters)
find Day Of Week 
for (DayOfWeek dow : DayOfWeek.values()) {
    if (threeLetters.equals(dow.getDisplayName(TextStyle.SHORT, Locale.ENGLISH))) {
        return dow;
return null;
DatefirstDateAfterAddWeeks(Date early, int weeks)
first Date After Add Weeks 
Date firstDate = getThisweekFirst(early);
firstDate = dayAdd(firstDate, weeks * 7);
return firstDate;
TemporalAdjusterfirstDayOfWeek()
java.time.temporal.TemporalAdjuster to select the first day of the week from a java.time.OffsetDateTime object. 
return t -> t.with(DAY_OF_WEEK, 1);