Like dragging and dropping an event, drag-and-drop is a feature to change the starting date and time of a task conveniently. You only need to click and hold your cursor over the task, drag and drop it to a new day and a new time area in the Calendar View pane.
To change a task duration (in the Day, Week and Work week views only), point your cursor over the Scroll button at the bottom of the task and drag it.
To change the date and time of a task, simply drag and drop the task to another area.
In the Day view, all tasks are shown in 1 day, so you can change the task time in one day only.
In the Week and Work week views, all tasks are shown in 1 week, so you can change both the task time and date.
In the Month view, all tasks are shown in 1 month, so you can change the task date only. You can also change the date for multiple tasks at the same time by ticking their checkboxes and using the drag-and-drop feature.
For shared and group calendars, you can only drag and drop their tasks if you have the Edit permission on these calendars. If you drag and drop the task that you do not have the Edit permission, you will receive a warning message informing that you are not allowed to edit this task.