The possibility the following filters:
X is an integer.
Currently we are limited to these values:

Yes, I need to filter contact persons on a date field with a range of 380 days from today.
@LaurensCleyman you can do it by yourself
@vovpff , how can I do that?
Php coding I think
You have to outsource this to your developer.
I'm not sure, but you'll probably find the conditions you need here:
\app\Conditions\RecordFields\DateField.php
\app\Condition.php
thanks @vdpawel to point me in the right direction ;-)