HOW TO test if a DateFormula variable is empty

We can learn a lot reading Microsoft standard C/AL code.

HOW TO test if a DateFormula variable is empty?

An example is offered in the Table 5088 Profile Questionnaire Line

TESTFIELD("Starting Date Formula",ZeroDateFormula);

Solution:
Create a Global Variable named like ZeroDateFormula of DataType DateFormula and don’t assign any value to it.

Now you can use this variable to test if a DateFormula variable is empty.

IF PeriodLength = ZeroDateFormula THEN
  ERROR(Text001); 

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