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I forwarded this feature request to our developers so they can evaluate its future implementation.
In the meanwhile you may try the Birth Date Picker as it does not display future dates:
You will be contacted via this thread once they have an update on this matter.
Please let us know if we can assist you further.
I'm sorry but I tried it and it does have future dates.
I apologize, you are right. It doesn't go further than 2014, but in fact accepts future dates inside this year.
In this case it is really necessary to wait for the developers' feedback or to try the workaround suggested in this thread with some conditions displaying error messages or hiding navigation button if a future date is inserted.
Again I apologize for the incorrect information. Please let us know if we can assist you further.
You can set a "Year to". Unfortunately, it is not possible to limit the month and day fields.
You can also use Carina's suggestion and use conditions to prevent people from selecting future dates