Reconciliation issue and reports Impact on different clenders usage in primary and secondary Ledgers

Business scenarios

Our client has scope of business more than 40 countries has Primary and secondary ledger with different calendars.
We wanted to understand, when AP is closed for current month as per Jan to Dec calendar there could be possibility of in secondary there are some more days left as it follows4-4-5 calendar for doing the transactions. If there are transactions done in that GAP dates  how will that be taken forward, meaning will that be considered in both ledger as it may fall in different calendar months.

Example: Primary Ledger in 01-Jan to 31- DEC calendar and Secondary is in 4-4-5  calendar.