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

intcalculateBusinessDays(Date startDate, Date endDate, int firstWeekendDay, int secondWeekendDay)
calculate Business Days 
Calendar startCal = Calendar.getInstance();
startCal.setTime(startDate);
Calendar endCal = Calendar.getInstance();
endCal.setTime(endDate);
int workDays = 0;
if (startCal.getTimeInMillis() == endCal.getTimeInMillis()) {
    return 0;
if (startCal.getTimeInMillis() > endCal.getTimeInMillis()) {
    startCal.setTime(endDate);
    endCal.setTime(startDate);
do {
    startCal.add(Calendar.DAY_OF_MONTH, 1);
    if (startCal.get(Calendar.DAY_OF_WEEK) != firstWeekendDay
            && startCal.get(Calendar.DAY_OF_WEEK) != secondWeekendDay) {
        workDays++;
} while (startCal.getTimeInMillis() <= endCal.getTimeInMillis());
return workDays;
StringDay_Of_Week(String Date, int DayCase)
Da O Week 
StringBuffer dow = new StringBuffer(
        DOW[(int) (Math.floor((Cal_Julian(Date) + 2) - (Math.floor((Cal_Julian(Date) + 2) / 7) * 7)))]);
if ((DayCase == 1) || (DayCase == 2) || (DayCase == 3))
    dow = new StringBuffer(dow.substring(0, 3));
switch (DayCase) {
case 1:
case 4:
    return dow.toString().toUpperCase();
...
intdayForWeek(String pTime)
day For Week 
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
Calendar c = Calendar.getInstance();
int dayForWeek = 0;
try {
    c.setTime(format.parse(pTime));
    if (c.get(Calendar.DAY_OF_WEEK) == 1) {
        dayForWeek = 7;
    } else {
...
intdayForWeek(String pTime)
day For Week 
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
try {
    c.setTime(format.parse(pTime));
} catch (ParseException e) {
    e.printStackTrace();
int dayForWeek = 0;
...
ListdayForWeek(String weeks)
day For Week 
List<String> retDates = new ArrayList<String>();
int day = 1;
SimpleDateFormat time = new SimpleDateFormat("yyyy-MM-dd");
while (retDates.size() < 4) {
    Calendar cal = Calendar.getInstance();
    cal.add(Calendar.DATE, day);
    if (weeks.contains(String.valueOf(cal.get(Calendar.DAY_OF_WEEK) - 1))) {
        System.out.println(cal.get(Calendar.DAY_OF_WEEK) - 1);
...
intdayNumberOfWeek(Date date)
Day Number 
Calendar cal = Calendar.getInstance();
cal.setTime(date);
return cal.get(Calendar.DAY_OF_WEEK);
intDayOfTheWeek(Date dt)
Day Of The Week 
Calendar cal = new GregorianCalendar();
cal.setTime(dt);
return cal.get(Calendar.DAY_OF_WEEK);
intdayOfWeek(Date date)
day Of Week 
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
return dayWeek;
intdayOfWeek(Date inDate, TimeZone timeZone)
Calculate the day number for the given date. 
Calendar calendar = Calendar.getInstance(timeZone);
calendar.setTime(inDate);
return calendar.get(Calendar.DAY_OF_WEEK);
intdayOfWeek(Date time)
day Of Week 
Calendar c = Calendar.getInstance();
c.setTime(time);
int dayForWeek = 0;
if (c.get(Calendar.DAY_OF_WEEK) == 1) {
    dayForWeek = 7;
} else {
    dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1;
return dayForWeek;