Posting Date in FB60

Hi

we have an interface into SAP, which calls FB60 to post vendor invoices. Currently the posting date is defaulted as the current day. This works well until month end where for a few days the new period is opened, and the invoices need to be populated with posting date as first day of the next month.

Is there any BADI/User Exit that can be used with FB60, so we can modify the posting date.

Regards