We found the following problem.
When we change the current workdate (=date of the system) into another date, then this date is not remberred when we change the company in Microsoft Dynamics Business central.
For example. The current system date and workdate is 9th of September 2018. When we change the workdate of Microsoft Business Central into the 1th of June 2018. When we open then another company in Microsoft Business Central, then we see that the Workdate is put back in the systemdate, 9th of September 2018.
We have checked this in Microsoft Dynamics NAV (local client). Then after changing the company, the work date stayed the same.