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

booleanisAfterDay(Calendar cal1, Calendar cal2)

Checks if the first calendar date is after the second calendar date ignoring time. 

if (cal1 == null || cal2 == null) {
    throw new IllegalArgumentException("The dates must not be null");
if (cal1.get(Calendar.ERA) < cal2.get(Calendar.ERA))
    return false;
if (cal1.get(Calendar.ERA) > cal2.get(Calendar.ERA))
    return true;
if (cal1.get(Calendar.YEAR) < cal2.get(Calendar.YEAR))
...
booleanisAllDayEvent(Calendar dtStart, Calendar dtEnd)
is All Day Event 
boolean startAtNullOClock = false;
boolean endAtNullOClock = false;
boolean allDayEvent = false;
startAtNullOClock = ((dtStart.get(java.util.Calendar.MILLISECOND) == 0)
        && (dtStart.get(java.util.Calendar.SECOND) == 0) && (dtStart.get(java.util.Calendar.MINUTE) == 0)
        && (dtStart.get(java.util.Calendar.HOUR_OF_DAY) == 0));
endAtNullOClock = ((dtEnd.get(java.util.Calendar.MILLISECOND) == 0)
        && (dtEnd.get(java.util.Calendar.SECOND) == 0) && (dtEnd.get(java.util.Calendar.MINUTE) == 0)
...
booleanisBusinessDay(Calendar cal)
Is Date A Business Day? 
if (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY
        || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
    return false;
if (cal.get(Calendar.MONTH) == Calendar.JANUARY && cal.get(Calendar.DAY_OF_MONTH) == 1) {
    return false;
if (cal.get(Calendar.MONTH) == Calendar.DECEMBER && cal.get(Calendar.DAY_OF_MONTH) == 25) {
...
booleanisDayAfter(Calendar calendar, Calendar baseCalendar)
is Day After 
if (calendar.get(Calendar.YEAR) > baseCalendar.get(Calendar.YEAR)) {
    return true;
} else if (calendar.get(Calendar.YEAR) < baseCalendar.get(Calendar.YEAR)) {
    return false;
if (calendar.get(Calendar.MONTH) > baseCalendar.get(Calendar.MONTH)) {
    return true;
} else if (calendar.get(Calendar.MONTH) < baseCalendar.get(Calendar.MONTH)) {
...
booleanisDSTChangeDay(Calendar cal)
Determine whether a specific date is on DST change day 
return hoursInDay(cal) != 24;
booleanisEndOfDay(Calendar calendar)
Returns a boolean indicating if the given calendar represents the end of a day (in the calendar's time zone). 
Calendar temp = (Calendar) calendar.clone();
temp.add(Calendar.MILLISECOND, 1);
return temp.get(Calendar.DATE) != calendar.get(Calendar.DATE);
booleanisHolyday(Calendar c)
is Holyday 
int month = c.get(Calendar.MONTH);
int dayOfMonth = c.get(Calendar.DAY_OF_MONTH);
if (month == Calendar.JANUARY) {
    if (dayOfMonth == 1)
        return true; 
    if (dayOfMonth == 6)
        return true; 
if (month == Calendar.APRIL && dayOfMonth == 25)
    return true; 
if (month == Calendar.MAY && dayOfMonth == 1)
    return true; 
if (month == Calendar.JUNE && dayOfMonth == 2)
    return true; 
if (month == Calendar.AUGUST && dayOfMonth == 15)
    return true; 
if (month == Calendar.NOVEMBER && dayOfMonth == 1)
    return true; 
if (month == Calendar.DECEMBER) {
    if (dayOfMonth == 8)
        return true; 
    if (dayOfMonth == 25)
        return true; 
    if (dayOfMonth == 26)
        return true; 
if (month == easterMonth && dayOfMonth == easterDay)
    return true; 
if (month == mondayEasterMonth && dayOfMonth == mondayEasterDay)
    return true; 
return false;
booleanisRestDay(Calendar cal)
is Rest Day 
int weekDay = cal.get(Calendar.DAY_OF_WEEK);
return weekDay == Calendar.SATURDAY || weekDay == Calendar.SUNDAY;
booleanisSameDay(Calendar c1, Calendar c2)
is Same Day 
return c1.get(Calendar.YEAR) == c2.get(Calendar.YEAR) && c1.get(Calendar.MONTH) == c2.get(Calendar.MONTH)
        && c1.get(Calendar.DAY_OF_MONTH) == c2.get(Calendar.DAY_OF_MONTH);
booleanisSameDay(Calendar cal1, Calendar cal2)
is Same Day 
if (cal1 == null || cal2 == null) {
    throw new IllegalArgumentException("The date must not be null");
return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA)
        && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR)
        && cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR));