According to the plan notified to it may not be convenient in operation, because the plan is much closer to the sliding shelf too. If the original plan to inform that you must postpone start date 21
According to the plan, it may not be easy in practice due to successively move the Plantation too. , if the original plan to go this way you will not easily put off starting on day 21.
The plan says that may be inconvenient in practice because the planet move into successively too. In the original plan if that leads to your inconvenience will be delayed start date 21