Problem with changing program date after archiving old period

SUGGESTED

We've just archived an accounting period and are starting into a new one. When I set the program date to the start of the financial year, its posting transactions on the date entered, not the date from the start of the year. This is throwing out all my transactions and presumably opening balances. I haven't even tried entering bank balances yet

Same when I try to change the program date for posting invoices, it just posts on the same day I'm doing the transaction.

There is also a problem in that although statements are picking up the transactions within a defined period, say 1 month, the date displayed on the statement is todays date, not 1 week ago or whenever I have set the statement period up to.

Any idea whats the best course of action here?