Java Utililty Methods Day End

List of utility methods to do Day End

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Description

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

Method

longgetMinllisBetween(Date beginDate, Date endDate)
get Minllis Between 
Calendar d1 = new GregorianCalendar();
d1.setTime(beginDate);
Calendar d2 = new GregorianCalendar();
d2.setTime(endDate);
if (d1.after(d2)) {
    return 0;
long minllis = d2.getTimeInMillis() - d1.getTimeInMillis();
...
ListgetMondays(Date startDate, Date endDate)
get Mondays 
if (endDate != null && !startDate.before(endDate)) {
    throw new RuntimeException("startDate must before endDate.");
List<Date> mondayList = new ArrayList<Date>();
Date previousMonday = getPreviousMonday(endDate);
for (; !previousMonday.before(startDate); previousMonday = getPreviousMonday(previousMonday)) {
    mondayList.add(previousMonday);
return mondayList;
IntegergetMonthBetween(Date startDate, Date endDate)
get Month Between 
if (startDate == null || endDate == null || !startDate.before(endDate)) {
    return null;
Calendar start = Calendar.getInstance();
start.setTime(startDate);
Calendar end = Calendar.getInstance();
end.setTime(endDate);
int year1 = start.get(Calendar.YEAR);
...
intgetMonthCha(Date start, Date end)
get Month Cha 
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(start);
c2.setTime(end);
int y1 = c1.get(Calendar.YEAR);
int y2 = c2.get(Calendar.YEAR);
int m1 = c1.get(Calendar.MONTH);
int m2 = c2.get(Calendar.MONTH);
...
intgetMonthCount(Date startDate, Date endDate)
Return month count. 
int count = 1;
Calendar calendar = Calendar.getInstance();
calendar.setTime(endDate);
count += calendar.get(Calendar.YEAR) * 12 + calendar.get(Calendar.MONTH);
calendar.setTime(startDate);
count -= calendar.get(Calendar.YEAR) * 12 + calendar.get(Calendar.MONTH);
return count;
DategetMonthEnd(Date date)
get Month End 
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.MONTH, 1);
int index = calendar.get(Calendar.DAY_OF_MONTH);
calendar.add(Calendar.DATE, (-index));
return calendar.getTime();
DategetMonthEndDate(Date date)
get Month End Date 
GregorianCalendar c = new GregorianCalendar();
c.setTime(date);
int maxMonth = c.getActualMaximum(Calendar.DAY_OF_MONTH);
c.set(Calendar.DAY_OF_MONTH, maxMonth);
c.set(Calendar.HOUR_OF_DAY, 23);
c.set(Calendar.MINUTE, 59);
c.set(Calendar.SECOND, 59);
return c.getTime();
...
DategetMonthEndDate(int year, int month)
get Month End Date 
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
c.set(Calendar.DAY_OF_MONTH, 0);
c.set(Calendar.HOUR_OF_DAY, 23);
c.set(Calendar.MINUTE, 59);
c.set(Calendar.SECOND, 59);
return c.getTime();
...
LonggetMonthEndDate(Long day)
get Month End Date 
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(day);
int end = cal.getActualMaximum(Calendar.DATE);
cal.set(Calendar.DATE, end);
return cal.getTimeInMillis();
ListgetMonthFirstDays(Date startDate, Date endDate)
get Month First Days 
if (endDate != null && !startDate.before(endDate)) {
    throw new RuntimeException("startDate must before endDate.");
List<Date> monthFirstDayList = new ArrayList<Date>();
Date previousMonthFirstDay = getPreviousMonthFirstDay(endDate);
for (; !previousMonthFirstDay
        .before(startDate); previousMonthFirstDay = getPreviousMonthFirstDay(previousMonthFirstDay)) {
    monthFirstDayList.add(previousMonthFirstDay);
...