Java Utililty Methods Calendar Compare

List of utility methods to do Calendar Compare

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Description

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

Method

intcompare(Calendar c1, Calendar c2)
Compare to calendars. 
long m1 = c1.getTime().getTime();
long m2 = c2.getTime().getTime();
if (m1 < m2) {
    return -1;
if (m1 > m2) {
    return 1;
return 0;
intcompare(Calendar c1, Calendar c2)
compare 
if (c1 == null || c2 == null)
    return -1;
long r = c1.getTimeInMillis() - c2.getTimeInMillis();
if (r > 0)
    return 1;
else if (r == 0)
    return 0;
else
...
intcompare(Calendar c1, Calendar c2, int what)
compare 
int number = 0;
switch (what) {
case Calendar.YEAR:
    number = c1.get(Calendar.YEAR) - c2.get(Calendar.YEAR);
    break;
case Calendar.MONTH:
    int years = compare(c1, c2, Calendar.YEAR);
    number = 12 * years + c1.get(Calendar.MONTH) - c2.get(Calendar.MONTH);
...
intcompareCalendar(Calendar cal1, Calendar cal2)
Compare two calendars without time comparison 
if (cal1 == null || cal2 == null) {
    return 0;
if (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)) {
    return DATE1_EQUAL_DATE2;
if (cal1.get(Calendar.ERA) < cal2.get(Calendar.ERA) || cal1.get(Calendar.YEAR) < cal2.get(Calendar.YEAR)
...
intcompareDates(Calendar date1, Calendar date2)
Method that compares 2 dates, works similarly to the compareTo method from Calendar, but ignores the time, just uses the year, month and day 
int result = 0;
if (date1.get(Calendar.YEAR) == date2.get(Calendar.YEAR)) {
    if (date1.get(Calendar.MONTH) == date2.get(Calendar.MONTH)) {
        if (date1.get(Calendar.DAY_OF_MONTH) == date2.get(Calendar.DAY_OF_MONTH)) {
            result = 0;
        } else if (date1.get(Calendar.DAY_OF_MONTH) < date2.get(Calendar.DAY_OF_MONTH)) {
            result = -1;
        } else if (date1.get(Calendar.DAY_OF_MONTH) > date2.get(Calendar.DAY_OF_MONTH)) {
...
intcompareDates(final Calendar firstCal, final Calendar secondCal)
compare Dates 
int result = 0;
if (firstCal.get(Calendar.YEAR) > secondCal.get(Calendar.YEAR))
    result = 1;
else if (firstCal.get(Calendar.YEAR) < secondCal.get(Calendar.YEAR))
    result = -1;
else {
    if (firstCal.get(Calendar.MONTH) > secondCal.get(Calendar.MONTH))
        result = 1;
...
intcompareDateTime(final Calendar firstCal, final Calendar secondCal)
compare Date Time 
int result = 0;
result = compareDates(firstCal, secondCal);
if (result == 0) {
    result = compareTime(firstCal, secondCal);
if (result == 1)
    System.out.println("first date is greater than the second");
else if (result == -1)
...
intcompareDay(Calendar calendar, Calendar calendar1)
compare Day 
int i = compareYear(calendar, calendar1);
if (i != 0)
    return i;
else
    return calendar.get(Calendar.DAY_OF_YEAR) - calendar1.get(Calendar.DAY_OF_YEAR);
intcompareSameDay(Calendar first, Calendar second)
compare Same Day 
return (first.get(Calendar.YEAR) - second.get(Calendar.YEAR)) * 365
        + (first.get(Calendar.MONTH) - second.get(Calendar.MONTH)) * 30
        + (first.get(Calendar.DATE) - second.get(Calendar.DATE));
intcompareTime(final Calendar firstCal, final Calendar secondCal)
compare Time 
int result = 0;
        System.out.println("Calendar.AM_PM = 0, so comparing HOUR_OF_DAY");
        System.out.println("firstCal HOUR_OF_DAY " + firstCal.get(Calendar.HOUR_OF_DAY));
        System.out.println("secondCal HOUR_OF_DAY " + secondCal.get(Calendar.HOUR_OF_DAY));
        if (firstCal.get(Calendar.HOUR_OF_DAY) > secondCal.get(Calendar.HOUR_OF_DAY))
            result = 1;
...