Java Utililty Methods Week Day

List of utility methods to do Week Day

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Description

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

Method

DategetWeekDay(String dateString, int weekDay)
return date's weekday value of specified string value in format: yyyy-MM-dd Date first = DateUtil.getMonday(today,Calendar.SUNDAY); Date last = DateUtil.getMonday(today,Calendar.SATURDAY); 
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try {
    date = simpleDateFormat.parse(dateString);
} catch (Exception e) {
    e.printStackTrace();
Calendar calendar = Calendar.getInstance();
...
intgetWeekDay(String str)
get Week Day 
if (str.length() < 3) {
    return -1;
if (str.regionMatches(true, 0, "sunday", 0, str.length())) {
    return Calendar.SUNDAY;
} else if (str.regionMatches(true, 0, "monday", 0, str.length())) {
    return Calendar.MONDAY;
} else if (str.regionMatches(true, 0, "tuesday", 0, str.length())) {
...
StringgetWeekDayByDate(Date date)
get Week Day By Date 
SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
String week = sdf.format(date);
return week;
StringgetWeekDayCN()
get Week Day CN 
sdf.applyPattern("EEEE");
return sdf.format(new Date());
StringgetWeekdayForInt(int value)
Return a string name for the contants from Calendar. 
switch (value) {
case Calendar.MONDAY:
    return "Monday";
case Calendar.TUESDAY:
    return "Tuesday";
case Calendar.WEDNESDAY:
    return "Wednesday";
case Calendar.THURSDAY:
...
StringgetWeekdayName(Date date)
get Weekday Name 
return dfWeekday.format(date);
String[]getWeekdayNames()
get Weekday Names 
DateFormatSymbols symbols = new DateFormatSymbols(Locale.getDefault());
String[] dayNames = symbols.getWeekdays();
return Arrays.copyOfRange(dayNames, 1, 7);
String[]getWeekdayNames(Locale locale)
Get an array of weekday names for a given locale. 
SimpleDateFormat dayFormatter = new SimpleDateFormat("E", locale);
String[] weekdayName = new String[7];
GregorianCalendar cal = new GregorianCalendar(2005, java.util.Calendar.JANUARY, 1);
int currentWeekday = cal.get(java.util.Calendar.DAY_OF_WEEK);
int daysUntilNextSunday = java.util.Calendar.SATURDAY - currentWeekday + 1;
cal.add(java.util.Calendar.DAY_OF_MONTH, daysUntilNextSunday);
for (int iDay = 0; iDay < 7; iDay++) {
    weekdayName[iDay] = dayFormatter.format(cal.getTime()).subSequence(0, 1).toString();
...
intgetWeekDayNUM()
get Week Day NUM 
car.setTimeInMillis(System.currentTimeMillis());
return (car.get(Calendar.DAY_OF_WEEK) - 1) == 0 ? 7 : (car.get(Calendar.DAY_OF_WEEK) - 1);
intgetWeekdayOfDateTime(String datetime)
get Weekday Of Date Time 
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
try {
    c.setTime(df.parse(datetime));
} catch (Exception e) {
    e.printStackTrace();
int weekday = c.get(Calendar.DAY_OF_WEEK) - 1;
...