If you add a date (for example, DrawnDate), as a
property,
the software does not require you to enter a date for Value / Expression. However, if you do not
enter a date, Microsoft interprets the empty field as 1/1/1800 when you view
the document's
properties
in File Explorer.
Use an @ sign in front of single or double quotation marks (‘ or “) to
ensure that the expression evaluates correctly.
For example: 2@" X 2@" X
1/4@".
The @ sign also applies when referencing a Property Name that includes a quotation
mark. For example, if you have a file property whose name is Length12”, you must add an @ sign in Value/Text Expression for that property.