The Date-Time Picture (\@) field switch  specifies the display of a date or time. This switch is called a "picture" switch because you use symbols to represent the format of the field result (field results: Text or graphics inserted in a document when Microsoft Word carries out a field's instructions. When you print the document or hide field codes, the field results replace the field codes.) .  

For example, the switch \@ "dddd, MMMM d, yyyy" in the field { DATE \@ "dddd, MMMM d, yyyy" } displays "Friday, November 24, 2002."

Combine the following date and time instructions " day (d), month (M), and year (y); hours (h) and minutes (m) " to build a date-time picture. You can also include text, punctuation, and spaces.

Date instructions :

Month (M) The letter "M" must be uppercase to distinguish months from minutes.
  • M -   Displays the month as a number without a leading 0 (zero) for single-digit months. For example, July is "7".
  • MM - Displays the month as a number with a leading 0 (zero) for single-digit months. For example, July is "07" .
  • MMM - Displays the month as a three-letter abbreviation. For example, July is "Jul".
  • MMMM - Displays the month as its full name.

Day (d) - Displays the day of the month or the day of the week. The letter "d" can be either uppercase or lowercase.
  • d - Displays the day of the week or month as a number without a leading 0 (zero) for single-digit days. For example, the sixth day of the month is displayed as "6".
  • dd - Displays the day of the week or month as a number with a leading 0 (zero) for single-digit days. For example, the sixth day of the month is displayed as "06".
  • ddd - Displays the day of the week or month as a three-letter abbreviation. For example, Tuesday is displayed as "Tue". dddd - Displays the day of the week as its full name.

Year (y) - Displays the year as two or four digits. The letter "y" can be either uppercase or lowercase.
  • yy - Displays the year as two digits with a leading 0 (zero) for years 01 through 09. For example, 1999 is displayed as "99", and 2006 is displayed as "06".
  • yyyy - Displays the year as four digits.  

Additional information can be found in Microsoft help.  We suggest searching on "numeric picture switch"