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/**
* Light extension of {@link Calendar} that strips away time, keeping only date information
*/
private static class DateOnlyCalendar extends GregorianCalendar {

private static Pools.SimplePool sPools = new Pools.SimplePool<>(5);

private static DateOnlyCalendar obtain() {
DateOnlyCalendar instance = sPools.acquire();
return instance == null ? new DateOnlyCalendar() : instance;
}

public static DateOnlyCalendar today() {

return fromTime(System.currentTimeMillis());
}

public static DateOnlyCalendar fromTime(long timeMillis) {

if (timeMillis < 0) {
return null;
}
DateOnlyCalendar dateOnlyCalendar = DateOnlyCalendar.obtain();
dateOnlyCalendar.setTimeInMillis(timeMillis);
dateOnlyCalendar.stripTime();
//noinspection WrongConstant
dateOnlyCalendar.setFirstDayOfWeek(sWeekStart);
return dateOnlyCalendar;
}

private DateOnlyCalendar() {

super();
}

/**
* Checks if this instance falls in some month before given instance
* @param other instance to check against
* @return true if this instance is at least 1 'month' before, false otherwise
*/
public boolean monthBefore(DateOnlyCalendar other) {
int day = other.get(DAY_OF_MONTH);
other.set(DAY_OF_MONTH, 1);
boolean before = getTimeInMillis() < other.getTimeInMillis();
other.set(DAY_OF_MONTH, day);
return before;
}

/**
* Checks if this instance falls in some month after given instance
* @param other instance to check against
* @return true if this instance is at least 1 'month' after, false otherwise
*/
public boolean monthAfter(DateOnlyCalendar other) {
int day = other.get(DAY_OF_MONTH);
other.set(DAY_OF_MONTH, other.getActualMaximum(DAY_OF_MONTH));
boolean after = getTimeInMillis() > other.getTimeInMillis();
other.set(DAY_OF_MONTH, day);
return after;
}

public boolean sameMonth(DateOnlyCalendar other) {

return get(YEAR) == other.get(YEAR) && get(MONTH) == other.get(MONTH);
}

void stripTime() {

set(Calendar.HOUR_OF_DAY, 0);
set(Calendar.MINUTE, 0);
set(Calendar.SECOND, 0);
set(Calendar.MILLISECOND, 0);
}

void recycle() {

setTimeZone(TimeZone.getDefault());
sPools.release(this);
}
}
}