It is possible to show the costs and credits in different currencies, from U.S. Dollar, to EUR and much more. On the top of the left sidebar, you can chose the currency and the billing period.
The billing period is the length of time between the last statement closing date and the next. It’s always a month. It’s always the duration of a month, but it can start from the 15th of January to the 15th February for example. The billing period is chosen by the adminisator on the customer side.
You can show different billing period historically. Please note that once a billing period is closed, no changes can be done retrospectively.