Define the timespan of the schedule in the VJS
In the "Timespan" area of the "Setup" dialog you can specify start and end date of the timescale
Set the starting and ending date of the time scale depending of the working date: “-4M” in the Starting Date field will prepone the start date of the time scale by four months to the work date calculated by NAV, whereas “2M” in the Ending Date field will postpone the end date of the time scale by two months after the work date.

How start and end dates of the timescale are defined
Start and end date of the time scale are calculated by adding the intervals that were provided for starting and ending date to the working date.
