A project calendar is an important registrar for the accounting of contract progress. If it is not accurately defined and closely monitored throughout the project duration, it can lead to confusion and misleading calculations. With the scheduling programs, multiple calendars can be built and used on a per-task basis. However, it is recommended to minimize the quantity of these schedules to avoid any scheduling conflicts as the project is updated.

First, the workweek and hours must be implemented into the calendar of the baseline schedule. Beware of 9am to 5pm or Monday to Friday presets that are the default of your program. Go ahead and define exactly when the project will be under construction. Nonworking days need to be tracked and logged into the project-specific calendar in order to be left out on any duration totals. A common trick (or perhaps - an oversight) that can occur on a contractor Time Impact Analysis is when the claimed delay days includes nonworking days not originally designated in the calendar. It's important that the field supervisors are documenting and sharing their working day statements with the project scheduler so that any weather or client-interfered days are updated into the calendar.