Java Utililty Methods Week Calculate

List of utility methods to do Week Calculate

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Description

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

Method

CalendaralignWeek(Calendar timestamp)
Aligns the time fields to the start of the week. 
timestamp = alignDay(timestamp);
int dayOfWeek = timestamp.get(Calendar.DAY_OF_WEEK);
int offset = 1 - dayOfWeek;
if (offset == 0) {
    return timestamp;
return addDays(offset, timestamp);
intdiffWeeks(Date start, Date end)
Number of weeks difference between two dates 
if (start == null || end == null) {
    return -1;
return (int) ((end.getTime() - start.getTime()) / (1000 * 60 * 60 * 24 * 7) + 1);
Date[]getBounceDatesOfWeek(Date date)
get Bounce Dates Of Week 
Calendar calendar = new GregorianCalendar();
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
Date begin = calendar.getTime();
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
Date end = calendar.getTime();
return new Date[] { begin, end };
...
intgetCurrentWeekNum(Date startDate, Date endDate)
get Current Week Num 
return 0;
StringgetCurrWeek()
get Curr Week 
Calendar c = Calendar.getInstance();
int w = c.get(Calendar.WEEK_OF_YEAR);
if (w < 10) {
    return "0" + w;
return String.valueOf(w);
CalendargetEndOfWeek(Calendar cal)
Moves a calendar to the end of the week 
cal.add(Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK) - cal.get(Calendar.DAY_OF_WEEK));
return cal;
StringgetSeqWeek()
get Seq Week 
Calendar c = Calendar.getInstance(Locale.CHINA);
String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
if (week.length() == 1)
    week = "0" + week;
String year = Integer.toString(c.get(Calendar.YEAR));
return year + week;
intgetWeek(Date date)
get Week 
Calendar c = Calendar.getInstance();
c.setTime(date);
int day = c.get(Calendar.DAY_OF_WEEK);
if (day == 1) {
    return 7;
} else {
    return day - 1;
MapgetWeekAbscissa(Class cls)
get Week Abscissa 
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MINUTE, 0);
Date end = calendar.getTime();
calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
Date start = calendar.getTime();
Map<Date, T> week = new TreeMap<>();
...
intgetWeekNumberFromDate(Date date)
Compute the week number of parameter date 
if (date != null) {
    Calendar calendar = Calendar.getInstance();
    calendar.setFirstDayOfWeek(Calendar.MONDAY);
    calendar.setTime(date);
    return calendar.get(Calendar.WEEK_OF_YEAR);
} else {
    return 0;