One of the most challenging aspects of writing the date is knowing whether you should use a comma. It...

In very formal situations, such as invitations or business letters, you may need to write the date in...

. In European countries and most other places in the world, the day comes first, then the month, and...

Americans are middle endians. They write the date as month/day/year. For example, the fourth day in January...

It basically denote habit, custom, practice, repeated actions, general truth, permanent activity, etc....