week = func9.exec(t2);
assertEquals(week.intValue(), 15);
// Null handling
t1.set(0, null);
assertEquals(func1.exec(t1), null);
assertEquals(func2.exec(t1), null);
assertEquals(func3.exec(t1), null);
assertEquals(func4.exec(t1), null);
assertEquals(func5.exec(t1), null);
assertEquals(func6.exec(t1), null);