Date of birth and old

[diniero69]

Hi

How can i put a constraint to match the respondent's age to their previously entered date of birth

[danbjoseph]

This post explains how to calculate an age from a date of birth and a date:

Using Date of birth to restrict further capturing

Leap years and such make it challenging to calculate age. Can you ask the respondent's age and then use that answer to control the rest of the survey? I've modified your survey to use the int((${doi} - ${respondent_dob}) div 365) to calculate the age. And you can see that it doesn't work sometimes if the month/day of the two dates are close. age_check.xlsx (14.2 KB) Correct: [Screen Shot 2022-02-09 at 10.26.22 AM] Wrong: [Screen Shot 2022-02-09 at 10.26.31 AM] Correct: [Screen Shot 2…

Then you can use the result of the calculation in your constraint.

[Xiphware]

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