Steps to Reproduce

Run attached sample xlsx in keikai
repro.xlsx

Current Result

E2: 20
F2: 22

Expected Result

E2: 20
F2: 20

Debug Information

The org.zkoss.poi.ss.formula.atp.ArgumentsEvaluator.evaluateDatesArg(ValueEval, int, int) retrieve cells by area.getValue(i, j) where i and j are absolute coordinates, causes the wrong cells to be retrieved
Should use getAbsoluteValue instead

Workaround

deploy attached override class under org.zkoss.poi.ss.formula.atp.ArgumentsEvaluator ArgumentsEvaluator.java