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### Display Logic for Hidden Values

- You can put a display condition in a hidden value
The hidden value will hold the null value '' until its display condition is met. Once its display condition is met, it holds the calculated or loaded value.

- If you update the case from a hidden value, it will only update the case if its display condition is met.

# Examples

For further guidance on doing calculations please see Hidden Values Tutorial Part 1: Adding Two Questions Using a Hidden Value and Hidden Values Tutorial Part 2: Calculations Using a Date.

Other calculations can be found on this page.

*EDD calculations: http://www.perinatology.com/calculators/Due-Date.htm and http://nrhm-mctsrpt.nic.in/MHFW/UI/FAQAnc.aspx