Preview of Run-times is not correct

Current Situation

the preview of run times in the run editor is not correct when using the specific weekdays frequency, e.g. when defining running every second Friday the preview shows every second Thursday.

Desired Behavior

When using the frequency "every 2nd. Friday" the preview should display the planned starts for every second Friday and not every second Thursday.

How to reproduce

• Open the run time editor for an order in the inventory editor.
• schedule to run the second Friday of each month at 08:00.
• Click on show preview from run-time window.