What does the 'date' function on a watch typically display?

The 'date' function on a watch typically displays the numerical date of the month, which refers to the specific day of the month—like the 1st, 15th, or 30th. This feature shows the numerical date without accounting for the variability in month lengths, meaning it doesn't automatically adjust for months that are shorter or longer than 31 days. For example, it would continue to display "31" in April even though that month only has 30 days unless the user manually adjusts it.

The other options, while related to date functionalities, do not accurately describe the basic 'date' function. For instance, showing the day and month, or including the year, is typically associated with more advanced complications that go beyond the standard date function. The day of the week may also be displayed, but that falls under a different aspect of watch functionality, generally requiring a different display or setting adjustment.