Change the calendar assigned to a Ledger without re-implementing

 I'm looking for a way to change the calender for the one ledger to match the others so that I can implement Ledger Sets that include all ledgers.  The ledger that needs to be changed is associated with many sub-ledgers, so a re-implementation is not possible.

I have 69 ledgers, with about 50+ of these having associated sub-ledgers.  I would like to implement MOAC & Ledger Sets, however I have one ledger (our US ledger) that is assigned to a different calendar than all the other ledgers.  The US calendar use to have different periods, however since 2006 the periods are the same in both calendars.