Changing VAT start date

Changing VAT start date

Good Evening,

Kindly asssit with this issue.

1. When setting up, I set my start vat date as October 29th. The system as has taken my month end date as 29th instead of either 30th or 31st depending on the month.
2. IS it possible to file past months at this time or it can only be done when limped up.

Regards
Francis