How to deal with element input value UOM Time in the element input validation formula?

Summary

How to deal with element input value UOM Time in the element input validation formula?

Content

Dear experts,

 

I have a requirement to calculate hours in a payroll element using data in From/To input values.

From/To input values are defined as UOM Time.

Whatever I am trying to do with these fileds in the FF raises a NullPointer exception.

 

Does anybody faced with similar requirements /issues?

I appreciate any input?

 

There is a sample FF code below:

INPUTS ARE From1(date),

           To1(date),

           Total,

           Message(text)

 

DEFAULT FOR From1 IS '4712/12/31 00:00:00' (date)

DEFAULT FOR To1 IS '4712/12/31 00:00:00' (date)