Task for today / Infinite Task / Date and Time Deadline
1) Indicate a specific date by which the task is to be executed, use the Data deadline function, which is located in the 'Task parameters' tab.
2) Indicate that the task is to be done for today, but without giving a specific time, select "Task for today" in the section for the task. This section can be found in the General Settings of the task.
3) Indicate that the task is permanent, but that it has to be completed on several occasions at different times, in the section for the task, choose "Indefinite Task". This section can be found in the 'General settings' of the task.
An indefinite task can also be set in the task parameters tab. In order to create this, tick the checkbox "without an end date".