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If I understand correctly, the requirement on your jotform http://form.jotform.us/form/51826513930151 is you wanted the 2nd Date to be with 6 months range only base on the 1st Date
If it is possible to count the number of days (in 6 months) and then limit the form so that it will not allow submission if date range is more than the limit (6 months)
Specifically, check on our developers suggestion...
It is now possible to insert static dates using the date() function.
Here is an example form: http://form.jotform.com/form/50980479657976?
And here is how I created those conditions:
If you have any other questions or problems please let us know.
I will make a test form also and apply the solution to a clone of your form http://form.jotform.us/form/51826513930151
I will get back to you shortly.