Reference time for scheduling
Time periods before the scheduling basis time are in the past; time periods after it are in the future.
For time periods in the past, operations with results are assigned. For time periods in the future, plans are created.
Set the display start time expression and the display end time expression to specify how far in the past and future to display on charts and the like.
The time a project file is loaded is often used for the scheduling basis time.
See also "Table time chart window overview" in Online Help.