The documentation states:
The Logical Start is the date and time on which you expect the object to start; it is the time the system will use as basis for forecast calculations. By default, the current date/time is suggested.
This is not true. It defaults to 12/31/2017.
This bug will be fixed in the following versions:
Automic Web Interface 12.1.2 - planned release ~5/23/18
Automic Web Interface 12.2.0 - planned release ~6/29/18