How to roll into new year

Simple answer Im sure, but my tax year is from Sept 2012-June 2013 when I was entering sales it came up as

"The date must be between 01/07/2012 and 31/12/2012. If you want to process transactions in the the next year, choose Start new year or change session date from the maintenance menu to start a new year"

Which one is the correct one to use?

Thanks