jodd-core/src/main/java/jodd/time/JulianDate.java
public int daysSpan(final JulianDate otherDate) {
		int now = getJulianDayNumber();
		int then = otherDate.getJulianDayNumber();
		return now - then;
	}
public int daysSpan(final JulianDate otherDate) {
		int now = getJulianDayNumber();
		int then = otherDate.getJulianDayNumber();
		return now - then;
	}
Returns span between two days. Returned value may be positive (when this date
is after the provided one) or negative (when comparing to future date).