public int daysBetween(final DateHolder other) {
final DateHolder from, to;
if (this.getTimeInMillis() < other.getTimeInMillis()) {
from = this;
to = other;
} else {
from = other;
to = this;
}
int result = 0;
final int toYear = to.getYear();
final DateHolder dh = new DateHolder(from.getDate());
int endlessLoopProtection = 0;
while (dh.getYear() < toYear) {
final int fromDay = dh.getDayOfYear();
dh.setMonth(Calendar.DECEMBER);
dh.setDayOfMonth(31);
result += dh.getDayOfYear() - fromDay + 1;
dh.add(Calendar.DAY_OF_MONTH, 1);
if (++endlessLoopProtection > 5000) {
throw new IllegalArgumentException("Days between doesn's support more than 5000 years");
}
}
result += to.getDayOfYear() - dh.getDayOfYear();
if (this.getTimeInMillis() < other.getTimeInMillis()) {
return result;
} else {
return -result;
}
}
/**
* Has the given date the same day? The given date will be converted into a calendar (clone from
* this) with same time zone.
*
* @param date
* @return
*/
public boolean isSameDay(final DateHolder date) {
return getYear() == date.getYear() && getDayOfYear() == date.getDayOfYear();
}