Keeping year from date of birth in ODK

I want to keep the year from date of birth. for example 2019-03-28 I want to keep only 2019.
Is this possible in ODK.

Thank you!

https://docs.getodk.org/form-operators-functions/#formatting-dates-and-times-for-display

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A post was split to a new topic: Constrain date (year) between two dates