Yes, you can do that in two ways.
- First, Double click on the Task bar to edit the task; on the edit task pop up click on the start date & end date to edit the task.
- Hover on the task bar, when you see the arrow, drag the task bar to left to change the start date.
Once you fixed the start date, again hover on the task bar and drag the <–à icon to right to change the end date of the task.
Note: The task start & end date should not cross the milestone start date & end date. Also if a task is dependent on other task, the child or dependent task’s start date cannot be before the end date of parent task.
Tip: Use the Drag & drop option to edit the start & end date quickly.