# Formulaire

**URL:** <https://forum.getodk.org/t/formulaire/23313>\
**Category:** Support\
**Created:** [November 14, 2019, 12:24pm UTC](https://forum.getodk.org/t/formulaire/23313 "2019-11-14T12:24:42Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![elmps2018](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/elmps2018/32/2063_2.png) [@elmps2018](https://forum.getodk.org/u/elmps2018)\
**Post date:** [November 14, 2019, 5:58pm UTC](https://forum.getodk.org/t/formulaire/23313/2 "2019-11-14T17:58:16Z")

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Welcome to the ODK forum, @leader76 ! We're glad you're here. When you get a chance, please [introduce yourself on this forum thread](https://forum.getodk.org/t/-/6671). I'd also encourage you to add a real picture as your avatar because it helps build community!

It sounds like you are using ODK-X to build a survey and need to make the date of birth constrained to less than the date of the survey. You'll be able to do this with a constraint, which are described here in the documents as an optional column: [https://docs.opendatakit.org/odk-x/xlsx-converter-reference/#id3](https://docs.opendatakit.org/odk-x/xlsx-converter-reference/#id3)

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