jodd-core/src/main/java/jodd/time/JulianDate.java
public JulianDate sub(final JulianDate jds) {
		int i = this.integer - jds.integer;
		double f = this.fraction -jds.fraction;
		return new JulianDate(i, f);
	}
public JulianDate sub(final JulianDate jds) {
		int i = this.integer - jds.integer;
		double f = this.fraction -jds.fraction;
		return new JulianDate(i, f);
	}
Subtracts a JD from current instance.