Showing all-day or non-timed events in a task list

1. What is the essential difference between a task list and a calendar?
2. What is difference between task and event?
3. Should I use a to do list or a calendar?

What is the essential difference between a task list and a calendar?

Calendar and Tasks are closely connected time management tools. Calendar is used for events with a specific date and time, tasks are for assignments without a specific time slot (you can set a deadline, though).

What is difference between task and event?

An Event is placed on your Calendar with an option to invite others and set reminders leading up to the date and time of the occurrence. A Task, on the other hand, is an activity that must be performed by a given date, think of it as an item on your to-do list.

Should I use a to do list or a calendar?

The to do list is for tasks. The calendar is for events.