The Date field allows you to choose a date using a date-picker and set a specific date format.
If you specify a default value for a Date field (for example "today"), each time you open your document the date will automatically be set to that day.
Add more automation to your document when you combine Date with a Formula field:
DateAdd automatically calculates a new date
ParseDate automatically changes the formatting of another date in your document, without having to retype it