Calculate Age in ODK

[danbjoseph]

Please note there may be some times when the above calculation doesn't work.
See this post:

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…