When you're creating a task in a project, you can also add a start date to that task. Adding a start date and a due date will give your task a date range - this will give your team members a more precise information when the task should be done.
To create a task with a start and a due date, create a task like you normally would.
Click on the Date and time menu where you'll find an option Add start date.
Click on the Add start date menu and select the start and the end date in the calendar. Notice that Date and time has been changed to Date range.
Of course, if something has changed, you can always edit the date range by editing the task and clicking on Date range to adjust the start date and due date.