Java Utililty Methods Calendar Day

List of utility methods to do Calendar Day

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Description

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

Method

voidsetStartTimeOfDay(Calendar calender)
set Start Time Of Day 
calender.set(Calendar.HOUR_OF_DAY, calender.getActualMinimum(Calendar.HOUR_OF_DAY));
calender.set(Calendar.MINUTE, calender.getActualMinimum(Calendar.MINUTE));
calender.set(Calendar.SECOND, calender.getActualMinimum(Calendar.SECOND));
calender.set(Calendar.MILLISECOND, calender.getActualMinimum(Calendar.MILLISECOND));
CalendarsetToBeginningOfDay(Calendar cal)
This method will set the calenders hour/min/sec//milliseconds all to 0. 
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
cal.getTimeInMillis();
return (cal);
voidsetToStartOfDay(Calendar start)
set To Start Of Day 
start.set(GregorianCalendar.HOUR_OF_DAY, 0);
start.set(GregorianCalendar.MINUTE, 0);
voidsetToStartTimeOfTheDay(Calendar c)
set To Start Time Of The Day 
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
voidstartOfDay(Calendar calendar)
Adjust the given calendar to the first millisecond of the current day. 
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MILLISECOND, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MINUTE, 0);
longtoCountWorkDays(GregorianCalendar start, GregorianCalendar end)
to Count Work Days 
long result = 0;
GregorianCalendar startDate = new GregorianCalendar();
GregorianCalendar endDate = new GregorianCalendar();
startDate.setTime(start.getTime());
endDate.setTime(end.getTime());
if ((startDate.get(GregorianCalendar.DAY_OF_WEEK) % 7) <= 1) {
    startDate.add(GregorianCalendar.DATE, 2 - (startDate.get(GregorianCalendar.DAY_OF_WEEK) % 7));
if ((endDate.get(GregorianCalendar.DAY_OF_WEEK) % 7) <= 1) {
    endDate.add(GregorianCalendar.DATE, -1 - (endDate.get(GregorianCalendar.DAY_OF_WEEK) % 7));
long totaldays = toDayInterval(startDate, endDate);
int s = endDate.get(GregorianCalendar.DAY_OF_WEEK) - startDate.get(GregorianCalendar.DAY_OF_WEEK);
if (s < 0) {
    s += 5;
if (totaldays % 7 != 0)
    result = s + (totaldays / 7) * 5 + 1;
else
    result = (totaldays / 7) * 5;
if (result < 0) {
    result = 0;
return result;
CalendartodayCalendar()
today Calendar 
Calendar cal = new GregorianCalendar();
clearTime(cal);
return cal;
CalendartoEndOfDayCalendar(Date date)
to End Of Day Calendar 
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
return cal;
voidtoNextWorkDay(Calendar cal)
to Next Work Day 
if (isRestDay(cal)) {
    cal.add(Calendar.DATE, 1);
    toNextWorkDay(cal);
CalendartrimToDay(Calendar calendar)
Trims the specified calendar to the day by resetting the following attributes:
  • hour of day
  • minutes
  • seconds
  • milliseconds
The passed calendar is not modified by this method. 
Calendar cloneCal = (Calendar) calendar.clone();
cloneCal.set(Calendar.HOUR_OF_DAY, 0);
cloneCal.set(Calendar.MINUTE, 0);
cloneCal.set(Calendar.SECOND, 0);
cloneCal.set(Calendar.MILLISECOND, 0);
return cloneCal;