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  • Age in years: int((today() - date(#form//dob)) div 365.25)
  • Age in months: int((today() - date(#form//dob)) div 30.4)
  • Age in weeks: int((today() - date(#form//dob)) div 7)
  • Estimated Date of Delivery (EDD) from Last Menstrual Period (LMP): date(#form//lmp + 280)*
  • Summation of three questions: int(#form//question_one) + int(#form//question_two) + int(#form//question_three)

 

Operation ordering

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Expressions in CommCare are evaluated left to right. The following example illustrates how this impacts expressions:

 

A and B or C

 

is equivalent to:

 

((A and B) or C)

 

Should you wish to evaluate expressions differently you must use parentheses to indicate which elements should be evaluated together e.g.:

 

A and (B or C)

 

 

Display Logic for Hidden Values

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