Test optional timezone filtered by country with [form.timezone.filterout].Because of [form.maybenull=true] he initial timezone would be empty but [form.timezone.guess=true] makes it guessed from the user locale
Test optional timezone filtered by country with [form.timezone.filterout].Because of [form.maybenull=true] he initial timezone would be empty but [form.timezone.guess=true] makes it guessed from the user locale