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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Sorry I'm late. Author here. Yeah this is a limitation right now. For dates of birth and other hard/known dates, I would never recommend a date picker.
I plan to address this. Issue here https://github.com/WickyNilliams/cally/issues/9
Though I will likely never offer this functionality directly in the components themselves (per the docs: they are not meant to be a complete solution for date pickers, only the lower level parts that are hard to get right). But rather I'll open up the API to allow people to build this stuff themselves. I imagine I'll get this done in the next few days