Java Utililty Methods Calendar Time

List of utility methods to do Calendar Time

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Description

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

Method

booleanisSameLocalTime(Calendar cal1, Calendar cal2)

Checks if two calendar objects represent the same local time.

This method compares the values of the fields of the two objects. 

if (cal1 == null || cal2 == null) {
    throw new IllegalArgumentException("The date must not be null");
return (cal1.get(Calendar.MILLISECOND) == cal2.get(Calendar.MILLISECOND)
        && cal1.get(Calendar.SECOND) == cal2.get(Calendar.SECOND)
        && cal1.get(Calendar.MINUTE) == cal2.get(Calendar.MINUTE)
        && cal1.get(Calendar.HOUR) == cal2.get(Calendar.HOUR)
        && cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR)
...
booleanisSameTime(final Calendar aCal1, final Calendar aCal2)
is Same Time 
boolean retVal = aCal1.get(Calendar.HOUR_OF_DAY) == aCal2.get(Calendar.HOUR_OF_DAY);
retVal = retVal && (aCal1.get(Calendar.MINUTE) == aCal2.get(Calendar.MINUTE));
retVal = retVal && (aCal1.get(Calendar.SECOND) == aCal2.get(Calendar.SECOND));
return retVal;
booleanisSleepTime(Calendar calendar, String sleepTimeStart, String sleepTimeEnd)
is Sleep Time 
int sleepStart = Integer.parseInt(sleepTimeStart);
int sleepEnd = Integer.parseInt(sleepTimeEnd);
int hourofday = calendar.get(Calendar.HOUR_OF_DAY);
return hourofday >= sleepStart || hourofday <= sleepEnd;
booleanisTime0(final Calendar calendar)
is Time 
if (calendar.get(Calendar.HOUR_OF_DAY) == 0 && calendar.get(Calendar.MINUTE) == 0
        && calendar.get(Calendar.SECOND) == 0 && calendar.get(Calendar.MILLISECOND) == 0) {
    return true;
return false;
booleanisWorkTime(Calendar calendar, String workTimeStart, String workTimeEnd)
is Work Time 
int dayofweek = calendar.get(Calendar.DAY_OF_WEEK);
int hourofday = calendar.get(Calendar.HOUR_OF_DAY);
int workStart = Integer.parseInt(workTimeStart);
int workEnd = Integer.parseInt(workTimeEnd);
return dayofweek > Calendar.SUNDAY && dayofweek < Calendar.SATURDAY && hourofday >= workStart
        && hourofday <= workEnd;
voidmaximizeTimeFields(final Calendar calendar)
maximize Time Fields 
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
calendar.set(Calendar.MILLISECOND, 999);
Calendarmerge(Calendar date, Calendar time)
Merge two calendars, one with the day date component and the other with a time component. 
Calendar resCal = Calendar.getInstance();
if (date == null && time == null)
    return resCal;
if (date != null)
    resCal = (Calendar) date.clone();
resCal.clear();
if (null == time) {
    resCal.set(date.get(Calendar.YEAR), date.get(Calendar.MONTH), date.get(Calendar.DAY_OF_MONTH));
...
CalendarmergeDateAndTime(final Calendar date, final Calendar time)
merge Date And Time 
time.set(Calendar.YEAR, date.get(Calendar.YEAR));
time.set(Calendar.DAY_OF_MONTH, date.get(Calendar.DAY_OF_MONTH));
time.set(Calendar.MONTH, date.get(Calendar.MONTH));
return time;
CalendarmergeDateTime(Calendar date, Calendar time)
merge Date Time 
Calendar clendar = null;
if (date != null && time != null) {
    clendar = Calendar.getInstance();
    clendar.set(Calendar.YEAR, date.get(Calendar.YEAR));
    clendar.set(Calendar.MONTH, date.get(Calendar.MONTH));
    clendar.set(Calendar.DAY_OF_MONTH, date.get(Calendar.DAY_OF_MONTH));
    clendar.set(Calendar.HOUR_OF_DAY, time.get(Calendar.HOUR_OF_DAY));
    clendar.set(Calendar.MINUTE, time.get(Calendar.MINUTE));
...
CalendarnewCalendar(final long time)
new Calendar 
final Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(time);
return calendar;