Project End Date is a time when you are going to deliver the results of the project to its customer. The End Date is usually based upon estimating the Project Critical Path that is derived with a help of a network diagram showing all project tasks with their dependencies and estimates on durations, so all tasks having a zero float (that cannot be delayed or started earlier) form up the longest path from the project’s Start Date towards its End Date (summary duration of these tasks, is the minimal amount of time required to accomplish the project). Project End Date is documented in the contract, and if the project team don’t meet this date, the organization most likely will be imposed penalties.
Project End Date is one of the key project constraints to be negotiated with the project customers. Very often the customers demand a project to be completed sooner, but once an accurate estimation of a project is done, it becomes harder to satisfy this demand. The way which can be used to reduce time and make End Date closer is assigning more resources to tasks, making tasks divided into parts which will be executed in parallel. In such a situation accelerating of a project time usually means growth of a budget (for involving additional workers and equipment), but in other situations this can be impossible, hence other constraints of a project may need to be negotiated (trade-offs on quality and scope of a project).