Changing Fiscal Year-end Date

We have been instructed to change the year-end of a small associate company from 6/30 to 12/31. That means that the current period will be "stub" period. Our understanding is that all history will convert to years ending 12/31. That would make it difficult to reproduce any financial statements for the 12 months 7/1/13 to 6/30/14 without actually doing the math to add and subtract from years ending 12/31.

How do others handle the transition?