Depreciation Calculation R12855

When I run a full year depreciation calculation, the as of date is showing up incorrectly. We have 13 periods, with 12 being normal periods and the 13th just being the last day of the year for adjusting purposes. When I am running the depreciation, the as of date is showing the end of the 12th period, not our actual year end. In the processing option I enter 12 for the amount of normal periods. When I tried entering 13, all of the calculations were incorrect, but the date was correct. Any ideas on how to get the date to show up correctly without